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w in (-oo:+oo)
(3/4)*w+6 = 21/4 // - 21/4
(3/4)*w-(21/4)+6 = 0
(3/4)*w-21/4+6 = 0
3/4*w+3/4 = 0 // - 3/4
3/4*w = -3/4 // : 3/4
w = -3/4/3/4
w = -1
w = -1
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