19=-3(21-m)+2(m-4)

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Solution for 19=-3(21-m)+2(m-4) equation:


Simplifying
19 = -3(21 + -1m) + 2(m + -4)
19 = (21 * -3 + -1m * -3) + 2(m + -4)
19 = (-63 + 3m) + 2(m + -4)

Reorder the terms:
19 = -63 + 3m + 2(-4 + m)
19 = -63 + 3m + (-4 * 2 + m * 2)
19 = -63 + 3m + (-8 + 2m)

Reorder the terms:
19 = -63 + -8 + 3m + 2m

Combine like terms: -63 + -8 = -71
19 = -71 + 3m + 2m

Combine like terms: 3m + 2m = 5m
19 = -71 + 5m

Solving
19 = -71 + 5m

Solving for variable 'm'.

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

Add '-5m' to each side of the equation.
19 + -5m = -71 + 5m + -5m

Combine like terms: 5m + -5m = 0
19 + -5m = -71 + 0
19 + -5m = -71

Add '-19' to each side of the equation.
19 + -19 + -5m = -71 + -19

Combine like terms: 19 + -19 = 0
0 + -5m = -71 + -19
-5m = -71 + -19

Combine like terms: -71 + -19 = -90
-5m = -90

Divide each side by '-5'.
m = 18

Simplifying
m = 18

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