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w in (-oo:+oo)
6*w-((3/7)*w)-7 = -361/7 // + -361/7
6*w-((3/7)*w)-(-361/7)-7 = 0
6*w+(-3/7)*w+361/7-7 = 0
39/7*w+312/7 = 0 // - 312/7
39/7*w = -312/7 // : 39/7
w = -312/7/39/7
w = -8
w = -8
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