M-20=-45

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Solution for M-20=-45 equation: 


Simplifying
M + -20 = -45

Reorder the terms:
-20 + M = -45

Solving
-20 + M = -45

Solving for variable 'M'.

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

Add '20' to each side of the equation.
-20 + 20 + M = -45 + 20

Combine like terms: -20 + 20 = 0
0 + M = -45 + 20
M = -45 + 20

Combine like terms: -45 + 20 = -25
M = -25

Simplifying
M = -25

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