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x in (-oo:+oo)
2*((-5/2)*x+1)+5*x = 6 // - 6
2*((-5/2)*x+1)+5*x-6 = 0
2*(1-5/2*x)+5*x-6 = 0
2*(1-5/2*x)+5*x-6 = 0
2-6 = 0
-4 = 0
-4 = 0
x belongs to the empty set
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