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w in (-oo:+oo)
-4*w-3 = (3/7)*w-300/7 // - (3/7)*w-300/7
-4*w-((3/7)*w)-(-300/7)-3 = 0
(-3/7)*w-4*w+300/7-3 = 0
279/7-31/7*w = 0 // - 279/7
-31/7*w = -279/7 // : -31/7
w = -279/7/(-31/7)
w = 9
w = 9
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