w/-21

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Solution for w/-21 equation: 


w in (-oo:+oo)

w/(-2) < 1 // - 1

w/(-2)-1 < 0

-1/2*w-1 < 0 // + 1

-1/2*w < 1 // : -1/2

w > 1/(-1/2)

w > -2

w in (-2:+oo)

(-2:+oo)

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