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w in (-oo:+oo)
3*w+7*w-(8/7)-(2/3) = 12 // - 12
3*w+7*w-(8/7)-(2/3)-12 = 0
3*w+7*w-8/7-2/3-12 = 0
10*w-290/21 = 0 // + 290/21
10*w = 290/21 // : 10
w = 290/21/10
w = 29/21
w = 29/21
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