book Maths Puzzle Numerical Ability

4y-3(y+8)=12 can you please show how an tell how to solve

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book Other Question

(x-a)(x-b)(x-c).....(x-z)
what is the formula to solve this problem in a short cut way?
the answer to the following should be 4/3a, however, I cannot understand how - please help! Thank you!!

1/1.5 + 1/1.5=