9-y=x

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Solution for 9-y=x equation: 


Simplifying
9 + -1y = x

Solving
9 + -1y = x

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 + x

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

Divide each side by '-1'.
y = 9 + -1x

Simplifying
y = 9 + -1x

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