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x in (-oo:+oo)
-24 = 4*x-(7*x)+3 // - 4*x-(7*x)+3
7*x-(4*x)-24-3 = 0
7*x-4*x-24-3 = 0
3*x-27 = 0 // + 27
3*x = 27 // : 3
x = 27/3
x = 9
x = 9
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