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x in (-oo:+oo)
(-6/5)*x = -9 // + 9
(-6/5)*x+9 = 0
9-6/5*x = 0 // - 9
-6/5*x = -9 // : -6/5
x = -9/(-6/5)
x = 15/2
x = 15/2
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