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x in (-oo:+oo)
28 = 4*x+5*x+1 // - 4*x+5*x+1
28-(4*x)-(5*x)-1 = 0
28-4*x-5*x-1 = 0
27-9*x = 0 // - 27
-9*x = -27 // : -9
x = -27/(-9)
x = 3
x = 3
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