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w in (-oo:+oo)
(3/4)*w-9 = -27/2 // + -27/2
(3/4)*w-(-27/2)-9 = 0
(3/4)*w+27/2-9 = 0
3/4*w+9/2 = 0 // - 9/2
3/4*w = -9/2 // : 3/4
w = -9/2/3/4
w = -6
w = -6
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