M+45=123

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Solution for M+45=123 equation: 


Simplifying
M + 45 = 123

Reorder the terms:
45 + M = 123

Solving
45 + M = 123

Solving for variable 'M'.

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

Add '-45' to each side of the equation.
45 + -45 + M = 123 + -45

Combine like terms: 45 + -45 = 0
0 + M = 123 + -45
M = 123 + -45

Combine like terms: 123 + -45 = 78
M = 78

Simplifying
M = 78

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