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x in (-oo:+oo)
(j^1)/2+18*x = 6*(3*x+25) // - 6*(3*x+25)
(j^1)/2-(6*(3*x+25))+18*x = 0
j/2-6*(3*x+25)+18*x = 0
(-6*2*(3*x+25))/2+j/2+(2*18*x)/2 = 0
j-6*2*(3*x+25)+2*18*x = 0
j-36*x+36*x-300 = 0
j-300 = 0
(j-300)/2 = 0
(j-300)/2 = 0 // * 2
j-300 = 0
x belongs to the empty set
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