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w in (-oo:+oo)
-4*w-1 = -21/5 // + -21/5
-4*w-(-21/5)-1 = 0
21/5-4*w-1 = 0
16/5-4*w = 0 // - 16/5
-4*w = -16/5 // : -4
w = -16/5/(-4)
w = 4/5
w = 4/5
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