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c/2-3=-7
We move all terms to the left:
c/2-3-(-7)=0
We add all the numbers together, and all the variables
c/2+4=0
We multiply all the terms by the denominator
c+4*2=0
We add all the numbers together, and all the variables
c+8=0
We move all terms containing c to the left, all other terms to the right
c=-8
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