book Maths Puzzle Numerical Ability

6/5X-5/3=4X-7/3

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book Other Question

What are the steps in adding, subtracting, multiplying, and dividing these problems:
f(x)=3x^2+4x-5
g(x)=2x+9

&

f(x)=x/x+1
g(x)=x^2-1
What is 50% less thank 88?
My answer was 44. Is that right?
Thanks