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x in (-oo:+oo)
(2*a-b)/2-((4*a+2*b)/3) = 0
(2*a-b)/2+(-1*(4*a+2*b))/3 = 0
(3*(2*a-b))/(2*3)+(-1*2*(4*a+2*b))/(2*3) = 0
3*(2*a-b)-1*2*(4*a+2*b) = 0
-2*a-7*b = 0
(-2*a-7*b)/(2*3) = 0
(-2*a-7*b)/(2*3) = 0 // * 2*3
-2*a-7*b = 0
x belongs to the empty set
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