exam Maths Puzzle Numerical Ability

factor by grouping

10x^2 - 12xy + 35xy - 42y^2

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can you plese help me solve this problem please?
The sales price of a car is $12,590, which is 20% off the original price. What is the original price? To Whomever can assist, Thank you!

Suppose that a square and an equilateral triangle have the same perimeter. Each side of the equilateral triangle is 6 centimeters longer than each side of the square. Find the length of each side of the square.