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(x-6)/3 = -3 // + 3
(x-6)/3+3 = 0
(x-6)/3+(3^2)/3 = 0
x-6+9 = 0
x+3 = 0
(x+3)/3 = 0
(x+3)/3 = 0 // * 3
x+3 = 0
x+3 = 0 // - 3
x = -3
x = -3
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