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w in (-oo:+oo)
(-1/3)*w-(2/7) = (6/7)*w-(102/7) // - (6/7)*w-(102/7)
(-1/3)*w-((6/7)*w)-(2/7)+102/7 = 0
(-1/3)*w+(-6/7)*w-2/7+102/7 = 0
100/7-25/21*w = 0 // - 100/7
-25/21*w = -100/7 // : -25/21
w = -100/7/(-25/21)
w = 12
w = 12
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