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w in (-oo:+oo)
((2*w)/3)*w = ((3*w)/4)*w+3 // - ((3*w)/4)*w+3
((2*w)/3)*w-(((3*w)/4)*w)-3 = 0
((2*w)/3)*w+(-3/4)*w^2-3 = 0
-1/12*w^2 = 3 // : -1/12
w^2 = -36
w belongs to the empty set
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