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w in (-oo:+oo)
(1/2)*w-6*w-6 = -15/8 // + -15/8
(1/2)*w-6*w-(-15/8)-6 = 0
(1/2)*w-6*w+15/8-6 = 0
-11/2*w-33/8 = 0 // + 33/8
-11/2*w = 33/8 // : -11/2
w = 33/8/(-11/2)
w = -3/4
w = -3/4
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