12y+21=-9

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Solution for 12y+21=-9 equation: 


Simplifying
12y + 21 = -9

Reorder the terms:
21 + 12y = -9

Solving
21 + 12y = -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 + 12y = -9 + -21

Combine like terms: 21 + -21 = 0
0 + 12y = -9 + -21
12y = -9 + -21

Combine like terms: -9 + -21 = -30
12y = -30

Divide each side by '12'.
y = -2.5

Simplifying
y = -2.5

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