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