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x in (-oo:+oo)
30/60 = x/3 // - x/3
30/60-(x/3) = 0
1/2-1/3*x = 0 // - 1/2
-1/3*x = -1/2 // : -1/3
x = -1/2/(-1/3)
x = 3/2
x = 3/2
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