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x in (-oo:+oo)
6 = (x-2)/3 // - (x-2)/3
6-((x-2)/3) = 0
(-1*(x-2))/3+6 = 0
(-1*(x-2))/3+(3*6)/3 = 0
3*6-1*(x-2) = 0
20-x = 0
(20-x)/3 = 0
(20-x)/3 = 0 // * 3
20-x = 0
20-x = 0 // - 20
-x = -20 // * -1
x = 20
x = 20
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