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0.8c+3.4=74
We move all terms to the left:
0.8c+3.4-(74)=0
We add all the numbers together, and all the variables
0.8c-70.6=0
We move all terms containing c to the left, all other terms to the right
0.8c=70.6
c=70.6/0.8
c=88+0.19999999999999/0.8
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