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w in (-oo:+oo)
-37/70 = (2/7)*w-2*w+1/2 // - (2/7)*w-2*w+1/2
-(-2*w)-((2/7)*w)-37/70-(1/2) = 0
2*w+(-2/7)*w-37/70-1/2 = 0
12/7*w-36/35 = 0 // + 36/35
12/7*w = 36/35 // : 12/7
w = 36/35/12/7
w = 3/5
w = 3/5
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