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x in (-oo:+oo)
2/3-5*x = -13/3 // + -13/3
2/3-5*x-(-13/3) = 0
2/3-5*x+13/3 = 0
5-5*x = 0 // - 5
-5*x = -5 // : -5
x = -5/(-5)
x = 1
x = 1
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