exam Maths Puzzle Numerical Ability

-6(a+5b)- 3(-7B-a)=

This is a problem from a worksheet I was given for homework. It did not come from my text book.

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exam Other Question
Solve 2ln(-x) = 7 The graph of a function F(x)=mx + b contains the points (5,15) and (-3,-5). Find b.