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w in (-oo:+oo)
-((5/6)*w)-(6*w)-5/7 = 1420/21 // - 1420/21
-((5/6)*w)-(6*w)-5/7-(1420/21) = 0
(-5/6)*w-6*w-5/7-1420/21 = 0
-41/6*w-205/3 = 0 // + 205/3
-41/6*w = 205/3 // : -41/6
w = 205/3/(-41/6)
w = -10
w = -10
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