book Maths Puzzle Numerical Ability

how do i solve this problem step by step?
{[18-2*6]-[40/(17-9)]}+{48-13*3+[(50-7*5+2]}

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book Other Question

WHICH IS THE SOLUTION OF THE SYSTEM GIVEN BELOW?

Y=-X+2
Y=-X-5

A. (2,1) B. (2,5)
C. NO SOLUTION D. INFINITELY MANY SOLUTIONS
a box contains red and green pencils only. a child randomly selects one pencil from the box. if p(red) = 3/5,
then p (green) =?

i got 2/5