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w in (-oo:+oo)
-7/4 = (-3/7)*w+1/2 // - (-3/7)*w+1/2
-((-3/7)*w)-7/4-(1/2) = 0
(3/7)*w-7/4-1/2 = 0
3/7*w-9/4 = 0 // + 9/4
3/7*w = 9/4 // : 3/7
w = 9/4/3/7
w = 21/4
w = 21/4
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