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x in (-oo:+oo)
19*(1/2) = (1/2)*(8*x+x) // - (1/2)*(8*x+x)
19*(1/2)-((1/2)*(8*x+x)) = 0
(-1/2)*(8*x+x)+19*(1/2) = 0
19/2-1/2*9*x = 0
(-1/2*2*9*x)/2+19/2 = 0
19-1/2*2*9*x = 0
19-9*x = 0
(19-9*x)/2 = 0
(19-9*x)/2 = 0 // * 2
19-9*x = 0
19-9*x = 0 // - 19
-9*x = -19 // : -9
x = -19/(-9)
x = 19/9
x = 19/9
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