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(x-9)/5 = -3 // + 3
(x-9)/5+3 = 0
(x-9)/5+(3*5)/5 = 0
x+3*5-9 = 0
x+6 = 0
(x+6)/5 = 0
(x+6)/5 = 0 // * 5
x+6 = 0
x+6 = 0 // - 6
x = -6
x = -6
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