y/2=-1

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Solution for y/2=-1 equation: 


y in (-oo:+oo)

y/2 = -1 // + 1

y/2+1 = 0

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

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

y = -1/1/2

y = -2

y = -2

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