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128=4(7+c)
We move all terms to the left:
128-(4(7+c))=0
We add all the numbers together, and all the variables
-(4(c+7))+128=0
We calculate terms in parentheses: -(4(c+7)), so:We get rid of parentheses
4(c+7)
We multiply parentheses
4c+28
Back to the equation:
-(4c+28)
-4c-28+128=0
We add all the numbers together, and all the variables
-4c+100=0
We move all terms containing c to the left, all other terms to the right
-4c=-100
c=-100/-4
c=+25
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