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w in (-oo:+oo)
(2*w+3)/(-12) = 1/4 // - 1/4
(2*w+3)/(-12)-(1/4) = 0
(2*w+3)/(-12)-1/4 = 0
(4*(2*w+3))/(-12*4)+(-12*(-1))/(-12*4) = 0
4*(2*w+3)-12*(-1) = 0
8*w+24 = 0
(8*w+24)/(-12*4) = 0
(8*w+24)/(-12*4) = 0 // * -12*4
8*w+24 = 0
8*w+24 = 0 // - 24
8*w = -24 // : 8
w = -24/8
w = -3
w = -3
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