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x in (-oo:+oo)
4*x-(7*x)-8 = 19 // - 19
4*x-(7*x)-19-8 = 0
4*x-7*x-19-8 = 0
-3*x-27 = 0 // + 27
-3*x = 27 // : -3
x = 27/(-3)
x = -9
x = -9
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