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x in (-oo:+oo)
x/4 = 12/16 // - 12/16
x/4-(12/16) = 0
x/4-3/4 = 0
1/4*x-3/4 = 0 // + 3/4
1/4*x = 3/4 // : 1/4
x = 3/4/1/4
x = 3
x = 3
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