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w in (-oo:+oo)
-29 = 2*w-4*w-9 // - 2*w-4*w-9
9-(-4*w)-(2*w)-29 = 0
4*w-2*w-29+9 = 0
2*w-20 = 0 // + 20
2*w = 20 // : 2
w = 20/2
w = 10
w = 10
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