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w in (-oo:+oo)
(2/5)*w-2 = -12/5 // + -12/5
(2/5)*w-(-12/5)-2 = 0
(2/5)*w+12/5-2 = 0
2/5*w+2/5 = 0 // - 2/5
2/5*w = -2/5 // : 2/5
w = -2/5/2/5
w = -1
w = -1
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