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2x+3(4x-5)=-57
We move all terms to the left:
2x+3(4x-5)-(-57)=0
We add all the numbers together, and all the variables
2x+3(4x-5)+57=0
We multiply parentheses
2x+12x-15+57=0
We add all the numbers together, and all the variables
14x+42=0
We move all terms containing x to the left, all other terms to the right
14x=-42
x=-42/14
x=-3
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