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x in (-oo:+oo)
15 = (5*x)/9 // - (5*x)/9
15-((5*x)/9) = 0
(-5/9)*x+15 = 0
15-5/9*x = 0 // - 15
-5/9*x = -15 // : -5/9
x = -15/(-5/9)
x = 27
x = 27
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