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x in (-oo:+oo)
9 = (3*x)/5 // - (3*x)/5
9-((3*x)/5) = 0
(-3/5)*x+9 = 0
9-3/5*x = 0 // - 9
-3/5*x = -9 // : -3/5
x = -9/(-3/5)
x = 15
x = 15
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