1/2-y=9

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Solution for 1/2-y=9 equation: 


y in (-oo:+oo)

1/2-y = 9 // - 9

1/2-y-9 = 0

-y-17/2 = 0 // + 17/2

-y = 17/2 // * -1

y = -17/2

y = -17/2

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