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x in (-oo:+oo)
4-5*x = 5*x-2 // - 5*x-2
2-5*x-(5*x)+4 = 0
2-5*x-5*x+4 = 0
6-10*x = 0 // - 6
-10*x = -6 // : -10
x = -6/(-10)
x = 3/5
x = 3/5
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