9-e=-12

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Solution for 9-e=-12 equation: 


Simplifying
9 + -1e = -12

Solving
9 + -1e = -12

Solving for variable 'e'.

Move all terms containing e to the left, all other terms to the right.

Add '-9' to each side of the equation.
9 + -9 + -1e = -12 + -9

Combine like terms: 9 + -9 = 0
0 + -1e = -12 + -9
-1e = -12 + -9

Combine like terms: -12 + -9 = -21
-1e = -21

Divide each side by '-1'.
e = 21

Simplifying
e = 21

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