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103=31+e/2
We move all terms to the left:
103-(31+e/2)=0
We add all the numbers together, and all the variables
-(e/2+31)+103=0
We get rid of parentheses
-e/2-31+103=0
We multiply all the terms by the denominator
-e-31*2+103*2=0
We add all the numbers together, and all the variables
-1e+144=0
We move all terms containing e to the left, all other terms to the right
-e=-144
e=-144/-1
e=+144
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