book Maths Puzzle Numerical Ability

-5w-2+w-1/3-w-3w+4w-1+w/9

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book Other Question

If the system 2x-5y=1 and -3x+7y=-3 is to be solved by elimination of x, and the first equation is multiplied by 3, then by which number should the second equation be multiplied?
*I think that the answer is 2.Is this correct? a single die is rolled twice. what is the probablity of getting a 3 on the first roll and a number greater than 4 on the second roll?