my-9=-13

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Solution for my-9=-13 equation: 


Simplifying
my + -9 = -13

Reorder the terms:
-9 + my = -13

Solving
-9 + my = -13

Solving for variable 'm'.

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

Add '9' to each side of the equation.
-9 + 9 + my = -13 + 9

Combine like terms: -9 + 9 = 0
0 + my = -13 + 9
my = -13 + 9

Combine like terms: -13 + 9 = -4
my = -4

Divide each side by 'y'.
m = -4y-1

Simplifying
m = -4y-1

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