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x in (-oo:+oo)
x-9 = (3/5)*x // - (3/5)*x
x-((3/5)*x)-9 = 0
x+(-3/5)*x-9 = 0
2/5*x-9 = 0 // + 9
2/5*x = 9 // : 2/5
x = 9/2/5
x = 45/2
x = 45/2
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