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21-e=15-3e
We move all terms to the left:
21-e-(15-3e)=0
We add all the numbers together, and all the variables
-e-(-3e+15)+21=0
We add all the numbers together, and all the variables
-1e-(-3e+15)+21=0
We get rid of parentheses
-1e+3e-15+21=0
We add all the numbers together, and all the variables
2e+6=0
We move all terms containing e to the left, all other terms to the right
2e=-6
e=-6/2
e=-3
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