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7e-2=5e+13
We move all terms to the left:
7e-2-(5e+13)=0
We get rid of parentheses
7e-5e-13-2=0
We add all the numbers together, and all the variables
2e-15=0
We move all terms containing e to the left, all other terms to the right
2e=15
e=15/2
e=7+1/2
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