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c/0.2+0.9=3.9
We move all terms to the left:
c/0.2+0.9-(3.9)=0
We add all the numbers together, and all the variables
c/0.2-3=0
We multiply all the terms by the denominator
c-3*0.2=0
We add all the numbers together, and all the variables
c-0.6=0
We move all terms containing c to the left, all other terms to the right
c=0.6
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