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-7x+2(5x-15)=-3
We move all terms to the left:
-7x+2(5x-15)-(-3)=0
We add all the numbers together, and all the variables
-7x+2(5x-15)+3=0
We multiply parentheses
-7x+10x-30+3=0
We add all the numbers together, and all the variables
3x-27=0
We move all terms containing x to the left, all other terms to the right
3x=27
x=27/3
x=9
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