3[m+5]=21

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Solution for 3[m+5]=21 equation: 


Simplifying
3[m + 5] = 21

Reorder the terms:
3[5 + m] = 21
[5 * 3 + m * 3] = 21
[15 + 3m] = 21

Solving
15 + 3m = 21

Solving for variable 'm'.

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

Add '-15' to each side of the equation.
15 + -15 + 3m = 21 + -15

Combine like terms: 15 + -15 = 0
0 + 3m = 21 + -15
3m = 21 + -15

Combine like terms: 21 + -15 = 6
3m = 6

Divide each side by '3'.
m = 2

Simplifying
m = 2

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