870-30m=1200

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Solution for 870-30m=1200 equation: 


Simplifying
870 + -30m = 1200

Solving
870 + -30m = 1200

Solving for variable 'm'.

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

Add '-870' to each side of the equation.
870 + -870 + -30m = 1200 + -870

Combine like terms: 870 + -870 = 0
0 + -30m = 1200 + -870
-30m = 1200 + -870

Combine like terms: 1200 + -870 = 330
-30m = 330

Divide each side by '-30'.
m = -11

Simplifying
m = -11

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