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-8.9c-8.98=-0.4c+8.12+8.6c
We move all terms to the left:
-8.9c-8.98-(-0.4c+8.12+8.6c)=0
We add all the numbers together, and all the variables
-8.9c-(8.2c+8.12)-8.98=0
We get rid of parentheses
-8.9c-8.2c-8.12-8.98=0
We add all the numbers together, and all the variables
-17.1c-17.1=0
We move all terms containing c to the left, all other terms to the right
-17.1c=17.1
c=17.1/-17.1
c=-1
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