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-5(4x-5)=21(7-x)
We move all terms to the left:
-5(4x-5)-(21(7-x))=0
We add all the numbers together, and all the variables
-5(4x-5)-(21(-1x+7))=0
We multiply parentheses
-20x-(21(-1x+7))+25=0
We calculate terms in parentheses: -(21(-1x+7)), so:We get rid of parentheses
21(-1x+7)
We multiply parentheses
-21x+147
Back to the equation:
-(-21x+147)
-20x+21x-147+25=0
We add all the numbers together, and all the variables
x-122=0
We move all terms containing x to the left, all other terms to the right
x=122
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