2[m+4]=21

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Solution for 2[m+4]=21 equation: 


Simplifying
2[m + 4] = 21

Reorder the terms:
2[4 + m] = 21
[4 * 2 + m * 2] = 21
[8 + 2m] = 21

Solving
8 + 2m = 21

Solving for variable 'm'.

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

Add '-8' to each side of the equation.
8 + -8 + 2m = 21 + -8

Combine like terms: 8 + -8 = 0
0 + 2m = 21 + -8
2m = 21 + -8

Combine like terms: 21 + -8 = 13
2m = 13

Divide each side by '2'.
m = 6.5

Simplifying
m = 6.5

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