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w in (-oo:+oo)
1/2-7*w = 15/2 // - 15/2
1/2-7*w-(15/2) = 0
1/2-7*w-15/2 = 0
-7*w-7 = 0 // + 7
-7*w = 7 // : -7
w = 7/(-7)
w = -1
w = -1
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