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4140=1900+70c
We move all terms to the left:
4140-(1900+70c)=0
We add all the numbers together, and all the variables
-(70c+1900)+4140=0
We get rid of parentheses
-70c-1900+4140=0
We add all the numbers together, and all the variables
-70c+2240=0
We move all terms containing c to the left, all other terms to the right
-70c=-2240
c=-2240/-70
c=+32
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