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w in (-oo:+oo)
1/2-6*w = -35/2 // + -35/2
1/2-6*w-(-35/2) = 0
1/2-6*w+35/2 = 0
18-6*w = 0 // - 18
-6*w = -18 // : -6
w = -18/(-6)
w = 3
w = 3
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