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