exam Maths Puzzle Numerical Ability

2[18-(5+3^2)/7]
we are doing the (pemdas) i'm not sure what to start with first do idivide or mulitply first

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Please help to solve

1/5x - 5/2y = -48

0.4x + 0.05y = 5

thank you!
9^2x . 27^(3-x)=1/9