\[3x-10=5\]

1
Add 1010 to both sides.
3x=5+103x=5+10

2
Simplify  5+105+10  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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