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-74=-3x-4(-5x-7)
We move all terms to the left:
-74-(-3x-4(-5x-7))=0
We calculate terms in parentheses: -(-3x-4(-5x-7)), so:We get rid of parentheses
-3x-4(-5x-7)
We multiply parentheses
-3x+20x+28
We add all the numbers together, and all the variables
17x+28
Back to the equation:
-(17x+28)
-17x-28-74=0
We add all the numbers together, and all the variables
-17x-102=0
We move all terms containing x to the left, all other terms to the right
-17x=102
x=102/-17
x=-6
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