Solve 8x − 4 = 132

The solution of 8x − 4 = 132 is x = 17.

8x - 4 = 132\ \Rightarrow\ x = 17

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The lines y = 8x − 4 and y = 132 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.
$8x - 4 = 132$
2
Add 4 to both sides:
$8x - 4 + 4 = 132 + 4 \ \Rightarrow\ 8x = 136$
3
Divide both sides by 8:
$\frac{8x}{8} = \frac{136}{8} \ \Rightarrow\ x = 17$
4
Check: put x = 17 back into the equation.
$8\cdot17 - 4 = 136 - 4 = 132 \checkmark$

LaTeX source of the formulas on this page

\[ 8x - 4 = 132\ \Rightarrow\ x = 17 \]
\[ 8x - 4 = 132 \]
\[ 8x - 4 + 4 = 132 + 4 \ \Rightarrow\ 8x = 136 \]
\[ \frac{8x}{8} = \frac{136}{8} \ \Rightarrow\ x = 17 \]
\[ 8\cdot17 - 4 = 136 - 4 = 132 \checkmark \]

Trying values of x in 8x − 4 = 132

x	8x − 4	Equals 132?
15	116	no
16	124	no
17	132	yes
18	140	no
19	148	no

Questions

What is x in 8x − 4 = 132?

The solution of 8x − 4 = 132 is x = 17.

How do you solve 8x − 4 = 132?

Add 4 to both sides to get 8x = 136, then divide both sides by 8 to get x = 17.

How do I check the answer?

Replace x by 17: 8(17) − 4 = 132, which is 132.

Solve 8x − 4 = 132

How to work it out

Trying values of x in 8x − 4 = 132

Questions

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