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-7(5c-5)=210
We move all terms to the left:
-7(5c-5)-(210)=0
We multiply parentheses
-35c+35-210=0
We add all the numbers together, and all the variables
-35c-175=0
We move all terms containing c to the left, all other terms to the right
-35c=175
c=175/-35
c=-5
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