\[3x-7=8\]
1
Add 77 to both sides.
3x=8+73x=8+7

2
Simplify  8+78+7  to  1515.
3x=153x=15

3
Divide both sides by 33.
x=153x=\frac{15}{3}

4
Simplify  153\frac{15}{3}  to  55.
x=5x=5

Done

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