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w in (-oo:+oo)
-((6/7)*w)-4/3 = 2/21 // - 2/21
-((6/7)*w)-4/3-(2/21) = 0
(-6/7)*w-4/3-2/21 = 0
-6/7*w-10/7 = 0 // + 10/7
-6/7*w = 10/7 // : -6/7
w = 10/7/(-6/7)
w = -5/3
w = -5/3
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