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w in (-oo:+oo)
(-4/5)*w+4 = 53/15 // - 53/15
(-4/5)*w-(53/15)+4 = 0
(-4/5)*w-53/15+4 = 0
7/15-4/5*w = 0 // - 7/15
-4/5*w = -7/15 // : -4/5
w = -7/15/(-4/5)
w = 7/12
w = 7/12
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