-9=7/2Y

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Solution for -9=7/2Y equation: 


Y in (-oo:+oo)

-9 = (7/2)*Y // - (7/2)*Y

-((7/2)*Y)-9 = 0

(-7/2)*Y-9 = 0

-7/2*Y-9 = 0 // + 9

-7/2*Y = 9 // : -7/2

Y = 9/(-7/2)

Y = -18/7

Y = -18/7

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