You can
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divided by

Invert the divisor (to find the reciprocal) and multiply.

Factorise 4x+16 to get 4(x+4) and factorise 3x+12 to get 3(x+4).

Cancel out the (x+4) terms.

Cancel down as much as possible
Final answer is 12/5 or 2 and 2/5