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w in (-oo:+oo)
7*w+(1/3)*w-(4/9) = 458/9 // - 458/9
7*w+(1/3)*w-(4/9)-(458/9) = 0
7*w+(1/3)*w-4/9-458/9 = 0
22/3*w-154/3 = 0 // + 154/3
22/3*w = 154/3 // : 22/3
w = 154/3/22/3
w = 7
w = 7
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