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w in (-oo:+oo)
(3/5)*w-((4/5)*w)-4 = -201/50 // + -201/50
(3/5)*w-((4/5)*w)-(-201/50)-4 = 0
(-4/5)*w+(3/5)*w+201/50-4 = 0
1/50-1/5*w = 0 // - 1/50
-1/5*w = -1/50 // : -1/5
w = -1/50/(-1/5)
w = 1/10
w = 1/10
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