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