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2x+3(-x-10)=30
We move all terms to the left:
2x+3(-x-10)-(30)=0
We add all the numbers together, and all the variables
2x+3(-1x-10)-30=0
We multiply parentheses
2x-3x-30-30=0
We add all the numbers together, and all the variables
-1x-60=0
We move all terms containing x to the left, all other terms to the right
-x=60
x=60/-1
x=-60
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