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(x-9)/6 = -5 // + 5
(x-9)/6+5 = 0
(x-9)/6+(5*6)/6 = 0
x+5*6-9 = 0
x+21 = 0
(x+21)/6 = 0
(x+21)/6 = 0 // * 6
x+21 = 0
x+21 = 0 // - 21
x = -21
x = -21
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