-40=1/2y

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Solution for -40=1/2y equation: 


y in (-oo:+oo)

-40 = (1/2)*y // - (1/2)*y

-((1/2)*y)-40 = 0

(-1/2)*y-40 = 0

-1/2*y-40 = 0 // + 40

-1/2*y = 40 // : -1/2

y = 40/(-1/2)

y = -80

y = -80

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