exam Maths Puzzle Numerical Ability

what if its x=y+1
x+2=6

or 3x-y=2
y=2x-9

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exam Other Question

Simplify

M4power(N -3power)2power/(M -2power)-3power/(M-4power N 8power/N 8power M -2power)2nd power x/ 1/x + x+1/1/x+1