=-(y-9)

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Solution for =-(y-9) equation: 


Simplifying
0 = -1(y + -9)

Reorder the terms:
0 = -1(-9 + y)
0 = (-9 * -1 + y * -1)
0 = (9 + -1y)

Solving
0 = 9 + -1y

Solving for variable 'y'.

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

Add 'y' to each side of the equation.
0 + y = 9 + -1y + y
Remove the zero:
y = 9 + -1y + y

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

Simplifying
y = 9

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