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x in (-oo:+oo)
5 = (6-x)/3 // - (6-x)/3
5-((6-x)/3) = 0
(-1*(6-x))/3+5 = 0
(-1*(6-x))/3+(3*5)/3 = 0
3*5-1*(6-x) = 0
x+9 = 0
(x+9)/3 = 0
(x+9)/3 = 0 // * 3
x+9 = 0
x+9 = 0 // - 9
x = -9
x = -9
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