book Maths Puzzle Numerical Ability

HOW WOULD YOU SIMPLIFY THIS EXPRESSION AND WHAT IS THE THINKING IN DOING SO ?


8A + B - 2A - 4B

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book Other Question

Determine the coordinates for graphing the equation 3Y + 2X = 4Y - 2
A) (0,2),(-1,0) B) (2,0),(0,-1) C) (3,2),(4,-2) D) (2,3),(-2,4)
i have tried this problem can't get it to work out

a over a+1 + 2a+4 over a^2-3a-4=2 over a-4

solve
please show work thanks