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40-4x=-8(-x+1)
We move all terms to the left:
40-4x-(-8(-x+1))=0
We add all the numbers together, and all the variables
-4x-(-8(-1x+1))+40=0
We calculate terms in parentheses: -(-8(-1x+1)), so:We get rid of parentheses
-8(-1x+1)
We multiply parentheses
8x-8
Back to the equation:
-(8x-8)
-4x-8x+8+40=0
We add all the numbers together, and all the variables
-12x+48=0
We move all terms containing x to the left, all other terms to the right
-12x=-48
x=-48/-12
x=+4
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