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w in (-oo:+oo)
-(5*w)-(4*w)-3/4 = -15/4 // + -15/4
-(5*w)-(4*w)-3/4-(-15/4) = 0
15/4-5*w-4*w-3/4 = 0
3-9*w = 0 // - 3
-9*w = -3 // : -9
w = -3/(-9)
w = 1/3
w = 1/3
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