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w in (-oo:+oo)
(1/5)*w-4 = (-3/5)*w-(196/45) // - (-3/5)*w-(196/45)
(1/5)*w-((-3/5)*w)+196/45-4 = 0
(1/5)*w+(3/5)*w+196/45-4 = 0
4/5*w+16/45 = 0 // - 16/45
4/5*w = -16/45 // : 4/5
w = -16/45/4/5
w = -4/9
w = -4/9
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