exam Maths Puzzle Numerical Ability

Help needed please. I am so lost with this question. Thank for any help given.

-3/5 + (8/35) =
Thank you.

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exam Other Question

A number N divides each of 17 & 30 with the same remainder in each case. What is the largest value N can have? Please help me with problem. It says to Simplify this expression. And im doing distributive property. (4-z)(-1)