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

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


Simplifying
4(m + -3) + -1(m + -3) = 21

Reorder the terms:
4(-3 + m) + -1(m + -3) = 21
(-3 * 4 + m * 4) + -1(m + -3) = 21
(-12 + 4m) + -1(m + -3) = 21

Reorder the terms:
-12 + 4m + -1(-3 + m) = 21
-12 + 4m + (-3 * -1 + m * -1) = 21
-12 + 4m + (3 + -1m) = 21

Reorder the terms:
-12 + 3 + 4m + -1m = 21

Combine like terms: -12 + 3 = -9
-9 + 4m + -1m = 21

Combine like terms: 4m + -1m = 3m
-9 + 3m = 21

Solving
-9 + 3m = 21

Solving for variable 'm'.

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

Add '9' to each side of the equation.
-9 + 9 + 3m = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 3m = 21 + 9
3m = 21 + 9

Combine like terms: 21 + 9 = 30
3m = 30

Divide each side by '3'.
m = 10

Simplifying
m = 10

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