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8.9=c+1.5
We move all terms to the left:
8.9-(c+1.5)=0
We get rid of parentheses
-c-1.5+8.9=0
We add all the numbers together, and all the variables
-1c+7.4=0
We move all terms containing c to the left, all other terms to the right
-c=-7.4
c=-7.4/-1
c=7+0.4/1
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