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w in (-oo:+oo)
7*w+(1/6)*w-4 = 26/15 // - 26/15
7*w+(1/6)*w-(26/15)-4 = 0
7*w+(1/6)*w-26/15-4 = 0
43/6*w-86/15 = 0 // + 86/15
43/6*w = 86/15 // : 43/6
w = 86/15/43/6
w = 4/5
w = 4/5
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