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5(2e+1)-2(3e-1)=19
We move all terms to the left:
5(2e+1)-2(3e-1)-(19)=0
We multiply parentheses
10e-6e+5+2-19=0
We add all the numbers together, and all the variables
4e-12=0
We move all terms containing e to the left, all other terms to the right
4e=12
e=12/4
e=3
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