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w in (-oo:+oo)
(7*w)/4+3 = (9*w)/10+2 // - (9*w)/10+2
(7*w)/4-((9*w)/10)-2+3 = 0
(7*w)/4+(-9/10)*w-2+3 = 0
17/20*w+1 = 0 // - 1
17/20*w = -1 // : 17/20
w = -1/17/20
w = -20/17
w = -20/17
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