Solve 4x − 12 = 56

The solution of 4x − 12 = 56 is x = 17.

4x - 12 = 56\ \Rightarrow\ x = 17

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The lines y = 4x − 12 and y = 56 meet at x = 17. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

1
The goal is to get x alone. Undo the operations in the opposite order: first the subtraction, then the multiplication.
$4x - 12 = 56$
2
Add 12 to both sides:
$4x - 12 + 12 = 56 + 12 \ \Rightarrow\ 4x = 68$
3
Divide both sides by 4:
$\frac{4x}{4} = \frac{68}{4} \ \Rightarrow\ x = 17$
4
Check: put x = 17 back into the equation.
$4\cdot17 - 12 = 68 - 12 = 56 \checkmark$

LaTeX source of the formulas on this page

\[ 4x - 12 = 56\ \Rightarrow\ x = 17 \]
\[ 4x - 12 = 56 \]
\[ 4x - 12 + 12 = 56 + 12 \ \Rightarrow\ 4x = 68 \]
\[ \frac{4x}{4} = \frac{68}{4} \ \Rightarrow\ x = 17 \]
\[ 4\cdot17 - 12 = 68 - 12 = 56 \checkmark \]

Trying values of x in 4x − 12 = 56

x	4x − 12	Equals 56?
15	48	no
16	52	no
17	56	yes
18	60	no
19	64	no

Questions

What is x in 4x − 12 = 56?

The solution of 4x − 12 = 56 is x = 17.

How do you solve 4x − 12 = 56?

Add 12 to both sides to get 4x = 68, then divide both sides by 4 to get x = 17.

How do I check the answer?

Replace x by 17: 4(17) − 12 = 56, which is 56.

Solve 4x − 12 = 56

How to work it out

Trying values of x in 4x − 12 = 56

Questions

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