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Solve 12x + 4 = 124

The solution of 12x + 4 = 124 is x = 10.

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The lines y = 12x + 4 and y = 124 meet at x = 1046810121416406080100120140160180200x = 10y = 12x + 4y = 124
The lines y = 12x + 4 and y = 124 meet at x = 10. 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.

    12x+4=12412x + 4 = 124
  2. 2

    Subtract 4 from both sides:

    12x+4−4=124−4 ⇒ 12x=12012x + 4 - 4 = 124 - 4 \ \Rightarrow\ 12x = 120
  3. 3

    Divide both sides by 12:

    12x12=12012 ⇒ x=10\frac{12x}{12} = \frac{120}{12} \ \Rightarrow\ x = 10
  4. 4

    Check: put x = 10 back into the equation.

    12⋅10+4=120+4=124✓12\cdot10 + 4 = 120 + 4 = 124 \checkmark
LaTeX source of the formulas on this page
\[ 12x + 4 = 124\ \Rightarrow\ x = 10 \]
\[ 12x + 4 = 124 \]
\[ 12x + 4 - 4 = 124 - 4 \ \Rightarrow\ 12x = 120 \]
\[ \frac{12x}{12} = \frac{120}{12} \ \Rightarrow\ x = 10 \]
\[ 12\cdot10 + 4 = 120 + 4 = 124 \checkmark \]

Trying values of x in 12x + 4 = 124

x12x + 4Equals 124?
8100no
9112no
10124yes
11136no
12148no

Questions

What is x in 12x + 4 = 124?

The solution of 12x + 4 = 124 is x = 10.

How do you solve 12x + 4 = 124?

Subtract 4 from both sides to get 12x = 120, then divide both sides by 12 to get x = 10.

How do I check the answer?

Replace x by 10: 12(10) + 4 = 124, which is 124.

Similar equations

    Solve 12x + 4 = 124: x = 10 (steps and check) | WordGPT