9-y=-9

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Solution for 9-y=-9 equation: 


Simplifying
9 + -1y = -9

Solving
9 + -1y = -9

Solving for variable 'y'.

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

Add '-9' to each side of the equation.
9 + -9 + -1y = -9 + -9

Combine like terms: 9 + -9 = 0
0 + -1y = -9 + -9
-1y = -9 + -9

Combine like terms: -9 + -9 = -18
-1y = -18

Divide each side by '-1'.
y = 18

Simplifying
y = 18

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