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w in (-oo:+oo)
(1/3)*w+6*w-7 = 112/3 // - 112/3
(1/3)*w+6*w-(112/3)-7 = 0
(1/3)*w+6*w-112/3-7 = 0
19/3*w-133/3 = 0 // + 133/3
19/3*w = 133/3 // : 19/3
w = 133/3/19/3
w = 7
w = 7
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