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x in (-oo:+oo)
(12/7)*(h+x)-((12/7)*x) = 0
(12/7)*(h+x)+(-12/7)*x = 0
12/7*(h+x)+(-12*x)/7 = 0
(12/7*7*(h+x))/7+(-12*x)/7 = 0
12/7*7*(h+x)-12*x = 0
12*h = 0
(12*h)/7 = 0
(12*h)/7 = 0 // * 7
12*h = 0
x belongs to the empty set
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