21+3y=12

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Solution for 21+3y=12 equation: 


Simplifying
21 + 3y = 12

Solving
21 + 3y = 12

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 + 3y = 12 + -21

Combine like terms: 21 + -21 = 0
0 + 3y = 12 + -21
3y = 12 + -21

Combine like terms: 12 + -21 = -9
3y = -9

Divide each side by '3'.
y = -3

Simplifying
y = -3

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