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x in (-oo:+oo)
9 = (18*x)/5 // - (18*x)/5
9-((18*x)/5) = 0
(-18/5)*x+9 = 0
9-18/5*x = 0 // - 9
-18/5*x = -9 // : -18/5
x = -9/(-18/5)
x = 5/2
x = 5/2
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