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x in (-oo:+oo)
13 = 5*x+x+8 // - 5*x+x+8
13-(5*x)-x-8 = 0
13-5*x-x-8 = 0
5-6*x = 0 // - 5
-6*x = -5 // : -6
x = -5/(-6)
x = 5/6
x = 5/6
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