exam Maths Puzzle Numerical Ability

simplify in the form of a+bi,2y-xi=4+x-i

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exam Other Question

I need your help to solve for X & Y using the addition method.

4x-5y=7
-4x+5y=7
My question is off a worksheet that if called Solving problems involving inequalities. It is "Find the largest pair of consectutive integers whos sum is less than 85."
My work is:
x+x+2<85
2x<83