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1.70=-2.1c+18.5
We move all terms to the left:
1.70-(-2.1c+18.5)=0
We add all the numbers together, and all the variables
-(-2.1c+18.5)+1.7=0
We get rid of parentheses
2.1c-18.5+1.7=0
We add all the numbers together, and all the variables
2.1c-16.8=0
We move all terms containing c to the left, all other terms to the right
2.1c=16.8
c=16.8/2.1
c=8
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