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126=-5x+3(2x+40)
We move all terms to the left:
126-(-5x+3(2x+40))=0
We calculate terms in parentheses: -(-5x+3(2x+40)), so:We get rid of parentheses
-5x+3(2x+40)
We multiply parentheses
-5x+6x+120
We add all the numbers together, and all the variables
x+120
Back to the equation:
-(x+120)
-x-120+126=0
We add all the numbers together, and all the variables
-1x+6=0
We move all terms containing x to the left, all other terms to the right
-x=-6
x=-6/-1
x=+6
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