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x in (-oo:+oo)
(5/4)*x+1/2 = 2*x-(1/2) // - 2*x-(1/2)
(5/4)*x-(2*x)+1/2+1/2 = 0
(5/4)*x-2*x+1/2+1/2 = 0
1-3/4*x = 0 // - 1
-3/4*x = -1 // : -3/4
x = -1/(-3/4)
x = 4/3
x = 4/3
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