exam Maths Puzzle Numerical Ability

Can I practice variables, substitution and elimination? I need practice with solving these problems

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exam Other Question

write the conjugate of the complex number 2+7i I am trying to show the result of adding two fractions.
x=times and /= divide

What are the steps to show that
u x i/2pi x (D+d)+ u x i/2pi x (D-d) is equalt to u x i x D/pi(D sq -d sq)

Hope you can help