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w in (-oo:+oo)
(3/2)*w-((7/5)*w) = -1/20 // + -1/20
(3/2)*w-((7/5)*w)-(-1/20) = 0
(3/2)*w+(-7/5)*w+1/20 = 0
1/10*w+1/20 = 0 // - 1/20
1/10*w = -1/20 // : 1/10
w = -1/20/1/10
w = -1/2
w = -1/2
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