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7c+12.5=10.5+11c
We move all terms to the left:
7c+12.5-(10.5+11c)=0
We add all the numbers together, and all the variables
7c-(11c+10.5)+12.5=0
We get rid of parentheses
7c-11c-10.5+12.5=0
We add all the numbers together, and all the variables
-4c+2=0
We move all terms containing c to the left, all other terms to the right
-4c=-2
c=-2/-4
c=1/2
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