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2x-7(5x+21)=15
We move all terms to the left:
2x-7(5x+21)-(15)=0
We multiply parentheses
2x-35x-147-15=0
We add all the numbers together, and all the variables
-33x-162=0
We move all terms containing x to the left, all other terms to the right
-33x=162
x=162/-33
x=-4+10/11
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