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x in (-oo:+oo)
2/3 = (3/5)*x // - (3/5)*x
2/3-((3/5)*x) = 0
(-3/5)*x+2/3 = 0
2/3-3/5*x = 0 // - 2/3
-3/5*x = -2/3 // : -3/5
x = -2/3/(-3/5)
x = 10/9
x = 10/9
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