\[3x+10=9\]
1
Subtract 1010 from both sides.
3x=9−103x=9-10

2
Simplify  9−109-10  to  −1-1.
3x=−13x=-1

3
Divide both sides by 33.
x=−13x=-\frac{1}{3}

Done

Decimal Form: -0.333333

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