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w in (-oo:+oo)
3*w+1/4 = (1/2)*w+21/4 // - (1/2)*w+21/4
3*w-((1/2)*w)+1/4-(21/4) = 0
3*w+(-1/2)*w+1/4-21/4 = 0
5/2*w-5 = 0 // + 5
5/2*w = 5 // : 5/2
w = 5/5/2
w = 2
w = 2
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