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x in (-oo:+oo)
(1/2)*x-(1/6) = 20 // - 20
(1/2)*x-(1/6)-20 = 0
(1/2)*x-1/6-20 = 0
1/2*x-121/6 = 0 // + 121/6
1/2*x = 121/6 // : 1/2
x = 121/6/1/2
x = 121/3
x = 121/3
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