39=-3(21-m)+3(m-4)

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Solution for 39=-3(21-m)+3(m-4) equation:


Simplifying
39 = -3(21 + -1m) + 3(m + -4)
39 = (21 * -3 + -1m * -3) + 3(m + -4)
39 = (-63 + 3m) + 3(m + -4)

Reorder the terms:
39 = -63 + 3m + 3(-4 + m)
39 = -63 + 3m + (-4 * 3 + m * 3)
39 = -63 + 3m + (-12 + 3m)

Reorder the terms:
39 = -63 + -12 + 3m + 3m

Combine like terms: -63 + -12 = -75
39 = -75 + 3m + 3m

Combine like terms: 3m + 3m = 6m
39 = -75 + 6m

Solving
39 = -75 + 6m

Solving for variable 'm'.

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

Add '-6m' to each side of the equation.
39 + -6m = -75 + 6m + -6m

Combine like terms: 6m + -6m = 0
39 + -6m = -75 + 0
39 + -6m = -75

Add '-39' to each side of the equation.
39 + -39 + -6m = -75 + -39

Combine like terms: 39 + -39 = 0
0 + -6m = -75 + -39
-6m = -75 + -39

Combine like terms: -75 + -39 = -114
-6m = -114

Divide each side by '-6'.
m = 19

Simplifying
m = 19

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