21=-10m+3

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Solution for 21=-10m+3 equation:


Simplifying
21 = -10m + 3

Reorder the terms:
21 = 3 + -10m

Solving
21 = 3 + -10m

Solving for variable 'm'.

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

Add '10m' to each side of the equation.
21 + 10m = 3 + -10m + 10m

Combine like terms: -10m + 10m = 0
21 + 10m = 3 + 0
21 + 10m = 3

Add '-21' to each side of the equation.
21 + -21 + 10m = 3 + -21

Combine like terms: 21 + -21 = 0
0 + 10m = 3 + -21
10m = 3 + -21

Combine like terms: 3 + -21 = -18
10m = -18

Divide each side by '10'.
m = -1.8

Simplifying
m = -1.8

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