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80.25-87c=73.35-64c
We move all terms to the left:
80.25-87c-(73.35-64c)=0
We add all the numbers together, and all the variables
-87c-(-64c+73.35)+80.25=0
We get rid of parentheses
-87c+64c-73.35+80.25=0
We add all the numbers together, and all the variables
-23c+6.9=0
We move all terms containing c to the left, all other terms to the right
-23c=-6.9
c=-6.9/-23
c=3.6315789473684/12.105263157895
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