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-5e+12=-3e+8
We move all terms to the left:
-5e+12-(-3e+8)=0
We get rid of parentheses
-5e+3e-8+12=0
We add all the numbers together, and all the variables
-2e+4=0
We move all terms containing e to the left, all other terms to the right
-2e=-4
e=-4/-2
e=+2
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