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-42=5(2c-9)-3(c+8)
We move all terms to the left:
-42-(5(2c-9)-3(c+8))=0
We calculate terms in parentheses: -(5(2c-9)-3(c+8)), so:We get rid of parentheses
5(2c-9)-3(c+8)
We multiply parentheses
10c-3c-45-24
We add all the numbers together, and all the variables
7c-69
Back to the equation:
-(7c-69)
-7c+69-42=0
We add all the numbers together, and all the variables
-7c+27=0
We move all terms containing c to the left, all other terms to the right
-7c=-27
c=-27/-7
c=3+6/7
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