exam Maths Puzzle Numerical Ability

Insert parentheses so that the equation is correct

(8+4x)(2+7)divided by 3=20

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exam Other Question

If x=3 and x=5, then form a quadratic equation Please help me with the following. Thank you in advance.
1)verify that f and g are inverses of each other:
f(x)= (8x/9)-(2/9)
g(x)= (9x/8)+(1/4)