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x in (-oo:+oo)
(x+108)/6 = 20 // - 20
(x+108)/6-20 = 0
(x+108)/6+(-20*6)/6 = 0
x-20*6+108 = 0
x-12 = 0
(x-12)/6 = 0
(x-12)/6 = 0 // * 6
x-12 = 0
x-12 = 0 // + 12
x = 12
x = 12
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