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w in (-oo:+oo)
(-3/7)*w-(1/2) = 29/14 // - 29/14
(-3/7)*w-(1/2)-(29/14) = 0
(-3/7)*w-1/2-29/14 = 0
-3/7*w-18/7 = 0 // + 18/7
-3/7*w = 18/7 // : -3/7
w = 18/7/(-3/7)
w = -6
w = -6
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