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x in (-oo:+oo)
5/9 = (3/4)*x // - (3/4)*x
5/9-((3/4)*x) = 0
(-3/4)*x+5/9 = 0
5/9-3/4*x = 0 // - 5/9
-3/4*x = -5/9 // : -3/4
x = -5/9/(-3/4)
x = 20/27
x = 20/27
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