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-31=-7(1-5x)-3(8-5x)
We move all terms to the left:
-31-(-7(1-5x)-3(8-5x))=0
We add all the numbers together, and all the variables
-(-7(-5x+1)-3(-5x+8))-31=0
We calculate terms in parentheses: -(-7(-5x+1)-3(-5x+8)), so:We get rid of parentheses
-7(-5x+1)-3(-5x+8)
We multiply parentheses
35x+15x-7-24
We add all the numbers together, and all the variables
50x-31
Back to the equation:
-(50x-31)
-50x+31-31=0
We add all the numbers together, and all the variables
-50x=0
x=0/-50
x=0
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