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x in (-oo:+oo)
33 = 5*x+3*x+9 // - 5*x+3*x+9
33-(5*x)-(3*x)-9 = 0
33-5*x-3*x-9 = 0
24-8*x = 0 // - 24
-8*x = -24 // : -8
x = -24/(-8)
x = 3
x = 3
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