exam Maths Puzzle Numerical Ability

19+(x/2)=4

if you can i nedd help help in

-1/5d-1=12

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exam Other Question

compute

{{{(1-1^2/100)*(1-2^2/100)*(1-3^2/100)*....*(1-2005^2)*(1-2006^2)}}}
Help me please i dont understand
2x+2/3y=-8
1/2x-1/3y=1