exam Maths Puzzle Numerical Ability

MAY I PLEASE SEE THE STEPS FOR SOLVING THIS SUBTRACTION PROBLEM
4X/(y^2z^3) - 7/(y^4z^4)

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exam Other Question

How do you write this in standard form: (5, -3),y=4x+2? I dont understand how you are supposed to justify each step because it just doesnt make sense to me...