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x in (-oo:+oo)
-((a-(2*b))/8)-((5*(b-(3*a)))/12)-(2*a) = 0
(-5/12)*(b-3*a)-((a-2*b)/8)-2*a = 0
(-1*(a-2*b))/8-5/12*(b-3*a)-2*a = 0
(-1*(a-2*b))/8+(-5/12*8*(b-3*a))/8+(-2*8*a)/8 = 0
-1*(a-2*b)-5/12*8*(b-3*a)-2*8*a = 0
9*a-16*a-4/3*b = 0
-7*a-4/3*b = 0
(-7*a-4/3*b)/8 = 0
(-7*a-4/3*b)/8 = 0 // * 8
-7*a-4/3*b = 0
x belongs to the empty set
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