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w in (-oo:+oo)
(4/5)*w-10 = -53/5 // + -53/5
(4/5)*w-(-53/5)-10 = 0
(4/5)*w+53/5-10 = 0
4/5*w+3/5 = 0 // - 3/5
4/5*w = -3/5 // : 4/5
w = -3/5/4/5
w = -3/4
w = -3/4
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