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3 = (6-x)/9 // - (6-x)/9
3-((6-x)/9) = 0
(-1*(6-x))/9+3 = 0
(-1*(6-x))/9+(3*9)/9 = 0
3*9-1*(6-x) = 0
x+21 = 0
(x+21)/9 = 0
(x+21)/9 = 0 // * 9
x+21 = 0
x+21 = 0 // - 21
x = -21
x = -21
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