exam Maths Puzzle Numerical Ability

Hello,
I could use some help with this problem.
Simplify the expression.
(4-7i

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exam Other Question

a=5+3(4-2) solve the given fractional equations. A. 4-a/1-a=12/3-a+1 B. 2x+7/14-x+6/7=5x-4/3x+1 . simplify the given complex fractions using the method you prefer. A. 1-A/A^1-1= B. x-x^2-1/x / 1-x-1/x=