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3/8 = 4*x-(2/12) // - 4*x-(2/12)
3/8-(4*x)+2/12 = 0
3/8-4*x+2/12 = 0
13/24-4*x = 0 // - 13/24
-4*x = -13/24 // : -4
x = -13/24/(-4)
x = 13/96
x = 13/96
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