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w in (-oo:+oo)
28 = 4*w+9*w-(1/5)+3/4 // - 4*w+9*w-(1/5)+3/4
1/5-(4*w)-(9*w)-(3/4)+28 = 0
1/5-4*w-9*w-3/4+28 = 0
549/20-13*w = 0 // - 549/20
-13*w = -549/20 // : -13
w = -549/20/(-13)
w = 549/260
w = 549/260
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