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x in (-oo:+oo)
(1/2)*x+9 = 5*x-1 // - 5*x-1
(1/2)*x-(5*x)+1+9 = 0
(1/2)*x-5*x+1+9 = 0
10-9/2*x = 0 // - 10
-9/2*x = -10 // : -9/2
x = -10/(-9/2)
x = 20/9
x = 20/9
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