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Solve 6x + 9 = 123

The solution of 6x + 9 = 123 is x = 19.

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The lines y = 6x + 9 and y = 123 meet at x = 191416182022248090100110120130140150160x = 19y = 6x + 9y = 123
The lines y = 6x + 9 and y = 123 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+9=1236x + 9 = 123
  2. 2

    Subtract 9 from both sides:

    6x+9−9=123−9 ⇒ 6x=1146x + 9 - 9 = 123 - 9 \ \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+9=114+9=123✓6\cdot19 + 9 = 114 + 9 = 123 \checkmark
LaTeX source of the formulas on this page
\[ 6x + 9 = 123\ \Rightarrow\ x = 19 \]
\[ 6x + 9 = 123 \]
\[ 6x + 9 - 9 = 123 - 9 \ \Rightarrow\ 6x = 114 \]
\[ \frac{6x}{6} = \frac{114}{6} \ \Rightarrow\ x = 19 \]
\[ 6\cdot19 + 9 = 114 + 9 = 123 \checkmark \]

Trying values of x in 6x + 9 = 123

x6x + 9Equals 123?
17111no
18117no
19123yes
20129no
21135no

Questions

What is x in 6x + 9 = 123?

The solution of 6x + 9 = 123 is x = 19.

How do you solve 6x + 9 = 123?

Subtract 9 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) + 9 = 123, which is 123.

Similar equations

    Solve 6x + 9 = 123: x = 19 (steps and check) | WordGPT