15=7-9y

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Solution for 15=7-9y equation:


Simplifying
15 = 7 + -9y

Solving
15 = 7 + -9y

Solving for variable 'y'.

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

Add '9y' to each side of the equation.
15 + 9y = 7 + -9y + 9y

Combine like terms: -9y + 9y = 0
15 + 9y = 7 + 0
15 + 9y = 7

Add '-15' to each side of the equation.
15 + -15 + 9y = 7 + -15

Combine like terms: 15 + -15 = 0
0 + 9y = 7 + -15
9y = 7 + -15

Combine like terms: 7 + -15 = -8
9y = -8

Divide each side by '9'.
y = -0.8888888889

Simplifying
y = -0.8888888889

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