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x in (-oo:+oo)
(9-x)/5 = 3 // - 3
(9-x)/5-3 = 0
(9-x)/5+(-3*5)/5 = 0
9-x-3*5 = 0
-x-6 = 0
(-x-6)/5 = 0
(-x-6)/5 = 0 // * 5
-x-6 = 0
-x-6 = 0 // + 6
-x = 6 // * -1
x = -6
x = -6
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