Simplify

Matching exercise

    
Match the items on the right to the items on the left.
(4x2 y / 2z2)  (6xz3/20y4)
(p2 - 10p + 21)/(p - 7) (p2 + p - 12)/(p-3)2
[5t3/(4t - 8)]  [(6t - 12)/10t]  
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