3x10=103x-10=10

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

2
Simplify  10+1010+10  to  2020.
3x=203x=20

3
Divide both sides by 33.
x=203x=\frac{20}{3}

Done

Decimal Form: 6.666667

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