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1-c/2=-1
We move all terms to the left:
1-c/2-(-1)=0
We add all the numbers together, and all the variables
-c/2+2=0
We multiply all the terms by the denominator
-c+2*2=0
We add all the numbers together, and all the variables
-1c+4=0
We move all terms containing c to the left, all other terms to the right
-c=-4
c=-4/-1
c=+4
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