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42=5x+4(-4x-17)
We move all terms to the left:
42-(5x+4(-4x-17))=0
We calculate terms in parentheses: -(5x+4(-4x-17)), so:We get rid of parentheses
5x+4(-4x-17)
We multiply parentheses
5x-16x-68
We add all the numbers together, and all the variables
-11x-68
Back to the equation:
-(-11x-68)
11x+68+42=0
We add all the numbers together, and all the variables
11x+110=0
We move all terms containing x to the left, all other terms to the right
11x=-110
x=-110/11
x=-10
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