[y+9]=21

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Solution for [y+9]=21 equation: 


Simplifying
[y + 9] = 21

Reorder the terms:
[9 + y] = 21

Remove brackets around [9 + y]
9 + y = 21

Solving
9 + y = 21

Solving for variable 'y'.

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

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

Combine like terms: 9 + -9 = 0
0 + y = 21 + -9
y = 21 + -9

Combine like terms: 21 + -9 = 12
y = 12

Simplifying
y = 12

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