Solve 7x + 15 = 134

The solution of 7x + 15 = 134 is x = 17.

7x + 15 = 134\ \Rightarrow\ x = 17

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The lines y = 7x + 15 and y = 134 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 addition, then the multiplication.
$7x + 15 = 134$
2
Subtract 15 from both sides:
$7x + 15 - 15 = 134 - 15 \ \Rightarrow\ 7x = 119$
3
Divide both sides by 7:
$\frac{7x}{7} = \frac{119}{7} \ \Rightarrow\ x = 17$
4
Check: put x = 17 back into the equation.
$7\cdot17 + 15 = 119 + 15 = 134 \checkmark$

LaTeX source of the formulas on this page

\[ 7x + 15 = 134\ \Rightarrow\ x = 17 \]
\[ 7x + 15 = 134 \]
\[ 7x + 15 - 15 = 134 - 15 \ \Rightarrow\ 7x = 119 \]
\[ \frac{7x}{7} = \frac{119}{7} \ \Rightarrow\ x = 17 \]
\[ 7\cdot17 + 15 = 119 + 15 = 134 \checkmark \]

Trying values of x in 7x + 15 = 134

x	7x + 15	Equals 134?
15	120	no
16	127	no
17	134	yes
18	141	no
19	148	no

Questions

What is x in 7x + 15 = 134?

The solution of 7x + 15 = 134 is x = 17.

How do you solve 7x + 15 = 134?

Subtract 15 from both sides to get 7x = 119, then divide both sides by 7 to get x = 17.

How do I check the answer?

Replace x by 17: 7(17) + 15 = 134, which is 134.

Solve 7x + 15 = 134

How to work it out

Trying values of x in 7x + 15 = 134

Questions

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