Solve 11x − 7 = 158

The solution of 11x − 7 = 158 is x = 15.

11x - 7 = 158\ \Rightarrow\ x = 15

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The lines y = 11x − 7 and y = 158 meet at x = 15. 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.
$11x - 7 = 158$
2
Add 7 to both sides:
$11x - 7 + 7 = 158 + 7 \ \Rightarrow\ 11x = 165$
3
Divide both sides by 11:
$\frac{11x}{11} = \frac{165}{11} \ \Rightarrow\ x = 15$
4
Check: put x = 15 back into the equation.
$11\cdot15 - 7 = 165 - 7 = 158 \checkmark$

LaTeX source of the formulas on this page

\[ 11x - 7 = 158\ \Rightarrow\ x = 15 \]
\[ 11x - 7 = 158 \]
\[ 11x - 7 + 7 = 158 + 7 \ \Rightarrow\ 11x = 165 \]
\[ \frac{11x}{11} = \frac{165}{11} \ \Rightarrow\ x = 15 \]
\[ 11\cdot15 - 7 = 165 - 7 = 158 \checkmark \]

Trying values of x in 11x − 7 = 158

x	11x − 7	Equals 158?
13	136	no
14	147	no
15	158	yes
16	169	no
17	180	no

Questions

What is x in 11x − 7 = 158?

The solution of 11x − 7 = 158 is x = 15.

How do you solve 11x − 7 = 158?

Add 7 to both sides to get 11x = 165, then divide both sides by 11 to get x = 15.

How do I check the answer?

Replace x by 15: 11(15) − 7 = 158, which is 158.

Solve 11x − 7 = 158

How to work it out

Trying values of x in 11x − 7 = 158

Questions

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