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78=1.5(100-c)
We move all terms to the left:
78-(1.5(100-c))=0
We add all the numbers together, and all the variables
-(1.5(-1c+100))+78=0
We calculate terms in parentheses: -(1.5(-1c+100)), so:We get rid of parentheses
1.5(-1c+100)
We multiply parentheses
-1.5c+150
Back to the equation:
-(-1.5c+150)
1.5c-150+78=0
We add all the numbers together, and all the variables
1.5c-72=0
We move all terms containing c to the left, all other terms to the right
1.5c=72
c=72/1.5
c=48
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