book Maths Puzzle Numerical Ability

What is -8x+-(5+3x)-2

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Please help me with this problem.Solving x,y,z(Crammer's linear System)

3x + 5y = 8
4 x + 7z =18
y+z= 3

Thanks for your time. I am having trouble understanding the terms FoG(2) and GoF(2)