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9c+7(c+10)=-10-10+c
We move all terms to the left:
9c+7(c+10)-(-10-10+c)=0
We add all the numbers together, and all the variables
9c+7(c+10)-(c-20)=0
We multiply parentheses
9c+7c-(c-20)+70=0
We get rid of parentheses
9c+7c-c+20+70=0
We add all the numbers together, and all the variables
15c+90=0
We move all terms containing c to the left, all other terms to the right
15c=-90
c=-90/15
c=-6
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