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