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x in (-oo:+oo)
x/12-((x-3)/3) = 1/2 // - 1/2
x/12-((x-3)/3)-(1/2) = 0
x/12-((x-3)/3)-1/2 = 0
(-1*(x-3))/3+x/12-1/2 = 0
(-1*2*12*(x-3))/(2*3*12)+(2*3*x)/(2*3*12)+(-1*3*12)/(2*3*12) = 0
2*3*x-1*2*12*(x-3)-1*3*12 = 0
72-18*x-36 = 0
36-18*x = 0
(36-18*x)/(2*3*12) = 0
(36-18*x)/(2*3*12) = 0 // * 2*3*12
36-18*x = 0
36-18*x = 0 // - 36
-18*x = -36 // : -18
x = -36/(-18)
x = 2
x = 2
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