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w in (-oo:+oo)
(-1/3)*w+1 = (4/5)*w+109/75 // - (4/5)*w+109/75
(-1/3)*w-((4/5)*w)-(109/75)+1 = 0
(-1/3)*w+(-4/5)*w-109/75+1 = 0
-17/15*w-34/75 = 0 // + 34/75
-17/15*w = 34/75 // : -17/15
w = 34/75/(-17/15)
w = -2/5
w = -2/5
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