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x in (-oo:+oo)
29 = 2*x+2*x+1 // - 2*x+2*x+1
29-(2*x)-(2*x)-1 = 0
29-2*x-2*x-1 = 0
28-4*x = 0 // - 28
-4*x = -28 // : -4
x = -28/(-4)
x = 7
x = 7
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