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5(-4c-7)-5(-2c-9)=102
We move all terms to the left:
5(-4c-7)-5(-2c-9)-(102)=0
We multiply parentheses
-20c+10c-35+45-102=0
We add all the numbers together, and all the variables
-10c-92=0
We move all terms containing c to the left, all other terms to the right
-10c=92
c=92/-10
c=-9+1/5
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