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x in (-oo:+oo)
39/78 = x/6 // - x/6
39/78-(x/6) = 0
1/2-1/6*x = 0 // - 1/2
-1/6*x = -1/2 // : -1/6
x = -1/2/(-1/6)
x = 3
x = 3
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