Simplify [tex]\frac{12}{84}[/tex], 84 ÷ 12 = 7, so, [tex]\frac{12}{84}[/tex] as a unit fraction equals; [tex]\frac{1}{7}[/tex]
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1/7
This is because 84 is divisible by 12 and that would leave 7 in the denominator with 1 on top