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x in (-oo:+oo)
2*x-(5*x)+4 = -20 // + 20
2*x-(5*x)+4+20 = 0
2*x-5*x+4+20 = 0
24-3*x = 0 // - 24
-3*x = -24 // : -3
x = -24/(-3)
x = 8
x = 8
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