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 (-oo:2)

(-oo:2)

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