exam Maths Puzzle Numerical Ability

Simplify each expression. The Distributive Property
-[-5(y+2z)-3z]

I am not sure how to do it.
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exam Other Question
-27+(-16)=? In a triangle, one angle is three times the measure of the second angle. The
third angle is twice the measure of the second angle. What is the measure of
each angle?

i do not understand this.