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2x+3(x+10)=15
We move all terms to the left:
2x+3(x+10)-(15)=0
We multiply parentheses
2x+3x+30-15=0
We add all the numbers together, and all the variables
5x+15=0
We move all terms containing x to the left, all other terms to the right
5x=-15
x=-15/5
x=-3
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