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x in (-oo:+oo)
-x-6 = 3*x-30 // - 3*x-30
30-x-(3*x)-6 = 0
30-x-3*x-6 = 0
24-4*x = 0 // - 24
-4*x = -24 // : -4
x = -24/(-4)
x = 6
x = 6
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