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w in (-oo:+oo)
(-1/3)*w+2 = 12/7 // - 12/7
(-1/3)*w-(12/7)+2 = 0
(-1/3)*w-12/7+2 = 0
2/7-1/3*w = 0 // - 2/7
-1/3*w = -2/7 // : -1/3
w = -2/7/(-1/3)
w = 6/7
w = 6/7
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