book Maths Puzzle Numerical Ability

i have this equation for hw but i dont know how to solve it can u help me please? its



x
- +2=4
2

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book Other Question

i have tried this problem can't get it to work out

a over a+1 + 2a+4 over a^2-3a-4=2 over a-4

solve
please show work thanks
find the square root of 12.