[18-m]+4=21

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Solution for [18-m]+4=21 equation:


Simplifying
[18 + -1m] + 4 = 21

Remove brackets around [18 + -1m]
18 + -1m + 4 = 21

Reorder the terms:
18 + 4 + -1m = 21

Combine like terms: 18 + 4 = 22
22 + -1m = 21

Solving
22 + -1m = 21

Solving for variable 'm'.

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

Add '-22' to each side of the equation.
22 + -22 + -1m = 21 + -22

Combine like terms: 22 + -22 = 0
0 + -1m = 21 + -22
-1m = 21 + -22

Combine like terms: 21 + -22 = -1
-1m = -1

Divide each side by '-1'.
m = 1

Simplifying
m = 1

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