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