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-217=-7-4c
We move all terms to the left:
-217-(-7-4c)=0
We add all the numbers together, and all the variables
-(-4c-7)-217=0
We get rid of parentheses
4c+7-217=0
We add all the numbers together, and all the variables
4c-210=0
We move all terms containing c to the left, all other terms to the right
4c=210
c=210/4
c=52+1/2
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