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Solve 6x + 15 = 129

The solution of 6x + 15 = 129 is x = 19.

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The lines y = 6x + 15 and y = 129 meet at x = 1914161820222490100110120130140150160170x = 19y = 6x + 15y = 129
The lines y = 6x + 15 and y = 129 meet at x = 19. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

  1. 1

    The goal is to get x alone. Undo the operations in the opposite order: first the addition, then the multiplication.

    6x+15=1296x + 15 = 129
  2. 2

    Subtract 15 from both sides:

    6x+15−15=129−15 ⇒ 6x=1146x + 15 - 15 = 129 - 15 \ \Rightarrow\ 6x = 114
  3. 3

    Divide both sides by 6:

    6x6=1146 ⇒ x=19\frac{6x}{6} = \frac{114}{6} \ \Rightarrow\ x = 19
  4. 4

    Check: put x = 19 back into the equation.

    6⋅19+15=114+15=129✓6\cdot19 + 15 = 114 + 15 = 129 \checkmark
LaTeX source of the formulas on this page
\[ 6x + 15 = 129\ \Rightarrow\ x = 19 \]
\[ 6x + 15 = 129 \]
\[ 6x + 15 - 15 = 129 - 15 \ \Rightarrow\ 6x = 114 \]
\[ \frac{6x}{6} = \frac{114}{6} \ \Rightarrow\ x = 19 \]
\[ 6\cdot19 + 15 = 114 + 15 = 129 \checkmark \]

Trying values of x in 6x + 15 = 129

x6x + 15Equals 129?
17117no
18123no
19129yes
20135no
21141no

Questions

What is x in 6x + 15 = 129?

The solution of 6x + 15 = 129 is x = 19.

How do you solve 6x + 15 = 129?

Subtract 15 from both sides to get 6x = 114, then divide both sides by 6 to get x = 19.

How do I check the answer?

Replace x by 19: 6(19) + 15 = 129, which is 129.

Similar equations

    Solve 6x + 15 = 129: x = 19 (steps and check) | WordGPT