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x in (-oo:+oo)
-(4*x)-6 = 3*x-27 // - 3*x-27
27-(4*x)-(3*x)-6 = 0
27-4*x-3*x-6 = 0
21-7*x = 0 // - 21
-7*x = -21 // : -7
x = -21/(-7)
x = 3
x = 3
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