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-7=e-78/10
We move all terms to the left:
-7-(e-78/10)=0
We add all the numbers together, and all the variables
-(+e-78/10)-7=0
We get rid of parentheses
-e-7+78/10=0
We multiply all the terms by the denominator
-e*10+78-7*10=0
We add all the numbers together, and all the variables
-e*10+8=0
Wy multiply elements
-10e+8=0
We move all terms containing e to the left, all other terms to the right
-10e=-8
e=-8/-10
e=4/5
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