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3x+3(-3x+10)=90
We move all terms to the left:
3x+3(-3x+10)-(90)=0
We multiply parentheses
3x-9x+30-90=0
We add all the numbers together, and all the variables
-6x-60=0
We move all terms containing x to the left, all other terms to the right
-6x=60
x=60/-6
x=-10
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