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w in (-oo:+oo)
-23 = (7/4)*w+5 // - (7/4)*w+5
-((7/4)*w)-23-5 = 0
(-7/4)*w-23-5 = 0
-7/4*w-28 = 0 // + 28
-7/4*w = 28 // : -7/4
w = 28/(-7/4)
w = -16
w = -16
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