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Solve 7x + 12 = 124

The solution of 7x + 12 = 124 is x = 16.

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The lines y = 7x + 12 and y = 124 meet at x = 161012141618202280100120140160x = 16y = 7x + 12y = 124
The lines y = 7x + 12 and y = 124 meet at x = 16. 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.

    7x+12=1247x + 12 = 124
  2. 2

    Subtract 12 from both sides:

    7x+12−12=124−12 ⇒ 7x=1127x + 12 - 12 = 124 - 12 \ \Rightarrow\ 7x = 112
  3. 3

    Divide both sides by 7:

    7x7=1127 ⇒ x=16\frac{7x}{7} = \frac{112}{7} \ \Rightarrow\ x = 16
  4. 4

    Check: put x = 16 back into the equation.

    7⋅16+12=112+12=124✓7\cdot16 + 12 = 112 + 12 = 124 \checkmark
LaTeX source of the formulas on this page
\[ 7x + 12 = 124\ \Rightarrow\ x = 16 \]
\[ 7x + 12 = 124 \]
\[ 7x + 12 - 12 = 124 - 12 \ \Rightarrow\ 7x = 112 \]
\[ \frac{7x}{7} = \frac{112}{7} \ \Rightarrow\ x = 16 \]
\[ 7\cdot16 + 12 = 112 + 12 = 124 \checkmark \]

Trying values of x in 7x + 12 = 124

x7x + 12Equals 124?
14110no
15117no
16124yes
17131no
18138no

Questions

What is x in 7x + 12 = 124?

The solution of 7x + 12 = 124 is x = 16.

How do you solve 7x + 12 = 124?

Subtract 12 from both sides to get 7x = 112, then divide both sides by 7 to get x = 16.

How do I check the answer?

Replace x by 16: 7(16) + 12 = 124, which is 124.

Similar equations

    Solve 7x + 12 = 124: x = 16 (steps and check) | WordGPT