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w in (-oo:+oo)
-7/2 = (-2/7)*w-(9/4) // - (-2/7)*w-(9/4)
9/4-((-2/7)*w)-7/2 = 0
(2/7)*w-7/2+9/4 = 0
2/7*w-5/4 = 0 // + 5/4
2/7*w = 5/4 // : 2/7
w = 5/4/2/7
w = 35/8
w = 35/8
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