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3 = (4-x)/3 // - (4-x)/3
3-((4-x)/3) = 0
(-1*(4-x))/3+3 = 0
(-1*(4-x))/3+(3^2)/3 = 0
9-1*(4-x) = 0
x+5 = 0
(x+5)/3 = 0
(x+5)/3 = 0 // * 3
x+5 = 0
x+5 = 0 // - 5
x = -5
x = -5
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