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40-5x=5(8-7x)
We move all terms to the left:
40-5x-(5(8-7x))=0
We add all the numbers together, and all the variables
-5x-(5(-7x+8))+40=0
We calculate terms in parentheses: -(5(-7x+8)), so:We get rid of parentheses
5(-7x+8)
We multiply parentheses
-35x+40
Back to the equation:
-(-35x+40)
-5x+35x-40+40=0
We add all the numbers together, and all the variables
30x=0
x=0/30
x=0
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