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w in (-oo:+oo)
w-((1/7)*w)+10 = 66/7 // - 66/7
w-((1/7)*w)-(66/7)+10 = 0
w+(-1/7)*w-66/7+10 = 0
6/7*w+4/7 = 0 // - 4/7
6/7*w = -4/7 // : 6/7
w = -4/7/6/7
w = -2/3
w = -2/3
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