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-42=3x+5(-x-4)
We move all terms to the left:
-42-(3x+5(-x-4))=0
We add all the numbers together, and all the variables
-(3x+5(-1x-4))-42=0
We calculate terms in parentheses: -(3x+5(-1x-4)), so:We get rid of parentheses
3x+5(-1x-4)
We multiply parentheses
3x-5x-20
We add all the numbers together, and all the variables
-2x-20
Back to the equation:
-(-2x-20)
2x+20-42=0
We add all the numbers together, and all the variables
2x-22=0
We move all terms containing x to the left, all other terms to the right
2x=22
x=22/2
x=11
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