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x in (-oo:+oo)
9-((6/5)*x) = 4 // - 4
9-((6/5)*x)-4 = 0
(-6/5)*x-4+9 = 0
5-6/5*x = 0 // - 5
-6/5*x = -5 // : -6/5
x = -5/(-6/5)
x = 25/6
x = 25/6
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