(Y+9)=21

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Solution for (Y+9)=21 equation: 


Simplifying
(Y + 9) = 21

Reorder the terms:
(9 + Y) = 21

Remove parenthesis 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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