m-9=20

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Solution for m-9=20 equation: 


Simplifying
m + -9 = 20

Reorder the terms:
-9 + m = 20

Solving
-9 + m = 20

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 + m = 20 + 9

Combine like terms: -9 + 9 = 0
0 + m = 20 + 9
m = 20 + 9

Combine like terms: 20 + 9 = 29
m = 29

Simplifying
m = 29

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