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5e-3(e+4)=30
We move all terms to the left:
5e-3(e+4)-(30)=0
We multiply parentheses
5e-3e-12-30=0
We add all the numbers together, and all the variables
2e-42=0
We move all terms containing e to the left, all other terms to the right
2e=42
e=42/2
e=21
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