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x in (-oo:+oo)
99 = 5*x-(2/3) // - 5*x-(2/3)
2/3-(5*x)+99 = 0
2/3-5*x+99 = 0
299/3-5*x = 0 // - 299/3
-5*x = -299/3 // : -5
x = -299/3/(-5)
x = 299/15
x = 299/15
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