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w in (-oo:+oo)
(7*w)/4+5 = (3*w)/10+1 // - (3*w)/10+1
(7*w)/4-((3*w)/10)-1+5 = 0
(7*w)/4+(-3/10)*w-1+5 = 0
29/20*w+4 = 0 // - 4
29/20*w = -4 // : 29/20
w = -4/29/20
w = -80/29
w = -80/29
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