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100=30+40+c
We move all terms to the left:
100-(30+40+c)=0
We add all the numbers together, and all the variables
-(c+70)+100=0
We get rid of parentheses
-c-70+100=0
We add all the numbers together, and all the variables
-1c+30=0
We move all terms containing c to the left, all other terms to the right
-c=-30
c=-30/-1
c=+30
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