exam Maths Puzzle Numerical Ability

How do I proof that ALL Right Angles Are Congruent?

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exam Other Question

Please solve the equation. 12x-28=-63+7x.
Thank u for all the help!
Solve: x/(x^2-36)+6/(x-6)=1/(x+6)

A. 7
B. -7
C. 6
D. no solution