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57=-4(x+2)-(5x-2)
We move all terms to the left:
57-(-4(x+2)-(5x-2))=0
We calculate terms in parentheses: -(-4(x+2)-(5x-2)), so:We get rid of parentheses
-4(x+2)-(5x-2)
We multiply parentheses
-4x-(5x-2)-8
We get rid of parentheses
-4x-5x+2-8
We add all the numbers together, and all the variables
-9x-6
Back to the equation:
-(-9x-6)
9x+6+57=0
We add all the numbers together, and all the variables
9x+63=0
We move all terms containing x to the left, all other terms to the right
9x=-63
x=-63/9
x=-7
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