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w in (-oo:+oo)
(3/5)*w-((1/5)*w)+10 = 4 // - 4
(3/5)*w-((1/5)*w)-4+10 = 0
(3/5)*w+(-1/5)*w-4+10 = 0
2/5*w+6 = 0 // - 6
2/5*w = -6 // : 2/5
w = -6/2/5
w = -15
w = -15
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