12=-7y-9

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Solution for 12=-7y-9 equation:


Simplifying
12 = -7y + -9

Reorder the terms:
12 = -9 + -7y

Solving
12 = -9 + -7y

Solving for variable 'y'.

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

Add '7y' to each side of the equation.
12 + 7y = -9 + -7y + 7y

Combine like terms: -7y + 7y = 0
12 + 7y = -9 + 0
12 + 7y = -9

Add '-12' to each side of the equation.
12 + -12 + 7y = -9 + -12

Combine like terms: 12 + -12 = 0
0 + 7y = -9 + -12
7y = -9 + -12

Combine like terms: -9 + -12 = -21
7y = -21

Divide each side by '7'.
y = -3

Simplifying
y = -3

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