-y-8x=9y

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Solution for -y-8x=9y equation: 


Simplifying
-1y + -8x = 9y

Reorder the terms:
-8x + -1y = 9y

Solving
-8x + -1y = 9y

Solving for variable 'x'.

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

Add 'y' to each side of the equation.
-8x + -1y + y = 9y + y

Combine like terms: -1y + y = 0
-8x + 0 = 9y + y
-8x = 9y + y

Combine like terms: 9y + y = 10y
-8x = 10y

Divide each side by '-8'.
x = -1.25y

Simplifying
x = -1.25y

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