Solve 7x − 8 = −8

The solution of 7x − 8 = −8 is x = 0.

7x - 8 = -8\ \Rightarrow\ x = 0

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The lines y = 7x − 8 and y = -8 meet at x = 0. 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.
$7x - 8 = -8$
2
Add 8 to both sides:
$7x - 8 + 8 = -8 + 8 \ \Rightarrow\ 7x = 0$
3
Divide both sides by 7:
$\frac{7x}{7} = \frac{0}{7} \ \Rightarrow\ x = 0$
4
Check: put x = 0 back into the equation.
$7\cdot0 - 8 = 0 - 8 = -8 \checkmark$

LaTeX source of the formulas on this page

\[ 7x - 8 = -8\ \Rightarrow\ x = 0 \]
\[ 7x - 8 = -8 \]
\[ 7x - 8 + 8 = -8 + 8 \ \Rightarrow\ 7x = 0 \]
\[ \frac{7x}{7} = \frac{0}{7} \ \Rightarrow\ x = 0 \]
\[ 7\cdot0 - 8 = 0 - 8 = -8 \checkmark \]

Trying values of x in 7x − 8 = −8

x	7x − 8	Equals -8?
-2	-22	no
-1	-15	no
0	-8	yes
1	-1	no
2	6	no

Questions

What is x in 7x − 8 = −8?

The solution of 7x − 8 = −8 is x = 0.

How do you solve 7x − 8 = −8?

Add 8 to both sides to get 7x = 0, then divide both sides by 7 to get x = 0.

How do I check the answer?

Replace x by 0: 7(0) − 8 = -8, which is -8.

Solve 7x − 8 = −8

How to work it out

Trying values of x in 7x − 8 = −8

Questions

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