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400+100c=550+70
We move all terms to the left:
400+100c-(550+70)=0
We add all the numbers together, and all the variables
100c+400-620=0
We add all the numbers together, and all the variables
100c-220=0
We move all terms containing c to the left, all other terms to the right
100c=220
c=220/100
c=2+1/5
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