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w in (-oo:+oo)
(-1/3)*w+7 = 83/12 // - 83/12
(-1/3)*w-(83/12)+7 = 0
(-1/3)*w-83/12+7 = 0
1/12-1/3*w = 0 // - 1/12
-1/3*w = -1/12 // : -1/3
w = -1/12/(-1/3)
w = 1/4
w = 1/4
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