M-2M-6M=90+3M

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Solution for M-2M-6M=90+3M equation: 


Simplifying
M + -2M + -6M = 90 + 3M

Combine like terms: M + -2M = -1M
-1M + -6M = 90 + 3M

Combine like terms: -1M + -6M = -7M
-7M = 90 + 3M

Solving
-7M = 90 + 3M

Solving for variable 'M'.

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

Add '-3M' to each side of the equation.
-7M + -3M = 90 + 3M + -3M

Combine like terms: -7M + -3M = -10M
-10M = 90 + 3M + -3M

Combine like terms: 3M + -3M = 0
-10M = 90 + 0
-10M = 90

Divide each side by '-10'.
M = -9

Simplifying
M = -9

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