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x in (-oo:+oo)
3/8 = x/12 // - x/12
3/8-(x/12) = 0
3/8-1/12*x = 0 // - 3/8
-1/12*x = -3/8 // : -1/12
x = -3/8/(-1/12)
x = 9/2
x = 9/2
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