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-7=-e/2-5
We move all terms to the left:
-7-(-e/2-5)=0
We get rid of parentheses
e/2+5-7=0
We multiply all the terms by the denominator
e+5*2-7*2=0
We add all the numbers together, and all the variables
e-4=0
We move all terms containing e to the left, all other terms to the right
e=4
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