Solve 8x − 8 = 104

The solution of 8x − 8 = 104 is x = 14.

8x - 8 = 104\ \Rightarrow\ x = 14

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The lines y = 8x − 8 and y = 104 meet at x = 14. 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.
$8x - 8 = 104$
2
Add 8 to both sides:
$8x - 8 + 8 = 104 + 8 \ \Rightarrow\ 8x = 112$
3
Divide both sides by 8:
$\frac{8x}{8} = \frac{112}{8} \ \Rightarrow\ x = 14$
4
Check: put x = 14 back into the equation.
$8\cdot14 - 8 = 112 - 8 = 104 \checkmark$

LaTeX source of the formulas on this page

\[ 8x - 8 = 104\ \Rightarrow\ x = 14 \]
\[ 8x - 8 = 104 \]
\[ 8x - 8 + 8 = 104 + 8 \ \Rightarrow\ 8x = 112 \]
\[ \frac{8x}{8} = \frac{112}{8} \ \Rightarrow\ x = 14 \]
\[ 8\cdot14 - 8 = 112 - 8 = 104 \checkmark \]

Trying values of x in 8x − 8 = 104

x	8x − 8	Equals 104?
12	88	no
13	96	no
14	104	yes
15	112	no
16	120	no

Questions

What is x in 8x − 8 = 104?

The solution of 8x − 8 = 104 is x = 14.

How do you solve 8x − 8 = 104?

Add 8 to both sides to get 8x = 112, then divide both sides by 8 to get x = 14.

How do I check the answer?

Replace x by 14: 8(14) − 8 = 104, which is 104.

Solve 8x − 8 = 104

How to work it out

Trying values of x in 8x − 8 = 104

Questions

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