Solve 7x − 9 = 110

The solution of 7x − 9 = 110 is x = 17.

7x - 9 = 110\ \Rightarrow\ x = 17

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The lines y = 7x − 9 and y = 110 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.
$7x - 9 = 110$
2
Add 9 to both sides:
$7x - 9 + 9 = 110 + 9 \ \Rightarrow\ 7x = 119$
3
Divide both sides by 7:
$\frac{7x}{7} = \frac{119}{7} \ \Rightarrow\ x = 17$
4
Check: put x = 17 back into the equation.
$7\cdot17 - 9 = 119 - 9 = 110 \checkmark$

LaTeX source of the formulas on this page

\[ 7x - 9 = 110\ \Rightarrow\ x = 17 \]
\[ 7x - 9 = 110 \]
\[ 7x - 9 + 9 = 110 + 9 \ \Rightarrow\ 7x = 119 \]
\[ \frac{7x}{7} = \frac{119}{7} \ \Rightarrow\ x = 17 \]
\[ 7\cdot17 - 9 = 119 - 9 = 110 \checkmark \]

Trying values of x in 7x − 9 = 110

x	7x − 9	Equals 110?
15	96	no
16	103	no
17	110	yes
18	117	no
19	124	no

Questions

What is x in 7x − 9 = 110?

The solution of 7x − 9 = 110 is x = 17.

How do you solve 7x − 9 = 110?

Add 9 to 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) − 9 = 110, which is 110.

Solve 7x − 9 = 110

How to work it out

Trying values of x in 7x − 9 = 110

Questions

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