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x in (-oo:+oo)
4*(2*a-(3*b)) = (2*a-(3*b))/4 // - (2*a-(3*b))/4
4*(2*a-(3*b))-((2*a-(3*b))/4) = 0
4*(2*a-3*b)-((2*a-3*b)/4) = 0
4*(2*a-3*b)+(-1*(2*a-3*b))/4 = 0
(4^2*(2*a-3*b))/4+(-1*(2*a-3*b))/4 = 0
4^2*(2*a-3*b)-1*(2*a-3*b) = 0
30*a-45*b = 0
(30*a-45*b)/4 = 0
(30*a-45*b)/4 = 0 // * 4
30*a-45*b = 0
x belongs to the empty set
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