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w in (-oo:+oo)
34/21 = (4/7)*w-4*w-(2/3) // - (4/7)*w-4*w-(2/3)
34/21-(-4*w)-((4/7)*w)+2/3 = 0
4*w+(-4/7)*w+34/21+2/3 = 0
24/7*w+16/7 = 0 // - 16/7
24/7*w = -16/7 // : 24/7
w = -16/7/24/7
w = -2/3
w = -2/3
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