3x2=10+x3x-2=10+x

1
Add 22 to both sides.
3x=10+x+23x=10+x+2

2
Simplify  10+x+210+x+2  to  x+12x+12.
3x=x+123x=x+12

3
Subtract xx from both sides.
3xx=123x-x=12

4
Simplify  3xx3x-x  to  2x2x.
2x=122x=12

5
Divide both sides by 22.
x=122x=\frac{12}{2}

6
Simplify  122\frac{12}{2}  to  66.
x=6x=6

Done

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