exam Maths Puzzle Numerical Ability

2x + 3y = 1
5x + 3y = 16
x = ?
y = ?

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exam Other Question

How do you solve the following equation?

3(x+5) = 20 - x. I do not know where to begin:
a^2+2a-24/a+1
divided by
a^2-a-12/(a+1)^2
I think I should divided the top and bottom by a-1 but I am not really sure