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w in (-oo:+oo)
(-2/5)*w+1 = (1/5)*w-31/5 // - (1/5)*w-31/5
(-2/5)*w-((1/5)*w)-(-31/5)+1 = 0
(-2/5)*w+(-1/5)*w+31/5+1 = 0
36/5-3/5*w = 0 // - 36/5
-3/5*w = -36/5 // : -3/5
w = -36/5/(-3/5)
w = 12
w = 12
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