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x in (-oo:+oo)
5*x-(27/(-3)) = -6 // + 6
5*x-(27/(-3))+6 = 0
5*x+6+9 = 0
5*x+15 = 0 // - 15
5*x = -15 // : 5
x = -15/5
x = -3
x = -3
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