21+y=9

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Solution for 21+y=9 equation: 


Simplifying
21 + y = 9

Solving
21 + y = 9

Solving for variable 'y'.

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

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

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

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

Simplifying
y = -12

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