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x in (-oo:+oo)
6*(5*x+9) = 384 // - 384
6*(5*x+9)-384 = 0
6*(5*x+9)-384 = 0
30*x-330 = 0
30*x-330 = 0
30*x-330 = 0 // + 330
30*x = 330 // : 30
x = 330/30
x = 11
x = 11
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