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w in (-oo:+oo)
-4/5 = (7/4)*w-(8/3) // - (7/4)*w-(8/3)
8/3-((7/4)*w)-4/5 = 0
(-7/4)*w-4/5+8/3 = 0
28/15-7/4*w = 0 // - 28/15
-7/4*w = -28/15 // : -7/4
w = -28/15/(-7/4)
w = 16/15
w = 16/15
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