book Maths Puzzle Numerical Ability

i need your help on this equasion ((( 67-3/4x=85 ))) i have no idea where to begin. thank you

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book Other Question

How do I multiply 4x to the exponent 2, all cubed? n -6 ___ X3 ____

Can you please solve this?

(n is in a circle exponent of -6 then another circle exponent of x & it has exponent of 3 then another circle. Thank you in