book Maths Puzzle Numerical Ability

-5(d+3)=7d+5 and 2/5(a+10)=1/4(a+20), these should help me with the rest of the problems. I am doing the problems so that I can check his work. Thanks.

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book Other Question

write the equation in standard form:

(2-3x)/y = 5

This is what I came up with:

y = 5(2-3x)

y = 10 - 15x

Any help would be great. Thank you!
3-3x=-6