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-5x+12-7x=-3(5x+7)
We move all terms to the left:
-5x+12-7x-(-3(5x+7))=0
We add all the numbers together, and all the variables
-12x-(-3(5x+7))+12=0
We calculate terms in parentheses: -(-3(5x+7)), so:We get rid of parentheses
-3(5x+7)
We multiply parentheses
-15x-21
Back to the equation:
-(-15x-21)
-12x+15x+21+12=0
We add all the numbers together, and all the variables
3x+33=0
We move all terms containing x to the left, all other terms to the right
3x=-33
x=-33/3
x=-11
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