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x in (-oo:+oo)
43/11 = x+x+3 // - x+x+3
43/11-x-x-3 = 0
10/11-2*x = 0 // - 10/11
-2*x = -10/11 // : -2
x = -10/11/(-2)
x = 5/11
x = 5/11
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