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(4*(5-w))/3 = -u // + u
(4*(5-w))/3+u = 0
(4*(5-w))/3+(3*u)/3 = 0
4*(5-w)+3*u = 0
3*u-4*w+20 = 0
(3*u-4*w+20)/3 = 0
(3*u-4*w+20)/3 = 0 // * 3
3*u-4*w+20 = 0
x belongs to the empty set
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