-4=M-13

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Solution for -4=M-13 equation:


Simplifying
-4 = M + -13

Reorder the terms:
-4 = -13 + M

Solving
-4 = -13 + M

Solving for variable 'M'.

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

Add '-1M' to each side of the equation.
-4 + -1M = -13 + M + -1M

Combine like terms: M + -1M = 0
-4 + -1M = -13 + 0
-4 + -1M = -13

Add '4' to each side of the equation.
-4 + 4 + -1M = -13 + 4

Combine like terms: -4 + 4 = 0
0 + -1M = -13 + 4
-1M = -13 + 4

Combine like terms: -13 + 4 = -9
-1M = -9

Divide each side by '-1'.
M = 9

Simplifying
M = 9

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