book Maths Puzzle Numerical Ability

5-1/2(x-6)=4 I know that x=8,I`m confused on how to break it down

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book Other Question

x^4 - 3x^2 + 2 = 0 If 3x-1=11, what is the value of x2squared +x?
1.12
2.15
3.16
4.18
5.20