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x in (-oo:+oo)
(3/9)*x = x-(5/10) // - x-(5/10)
(3/9)*x-x+5/10 = 0
1/2-2/3*x = 0 // - 1/2
-2/3*x = -1/2 // : -2/3
x = -1/2/(-2/3)
x = 3/4
x = 3/4
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