book Maths Puzzle Numerical Ability

Trying to find the answer to:

-6-(-7--15-(-12))

Cannot remember how to manipulate (-12) to work the problem.

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book Other Question

Subtract. Reduce answer to simplest form.

(2)/(5w + 10) minus (3)/(2w - 4)

Thanks! Perform the indicated operations in the proper order:
-17 - ( -2)( -6) + (- 24)/( -3)