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Solve the system and enter the code as x,y:
Equation A: 2x + y = 10
Equation B: x - y = 2
A rectangle has perimeter 20 cm. One side is 6 cm. What is the other side?
A phone was $200. It went on sale for 25% off. What is the sale price?
If f(x) = x² + 3, find f(5). Then subtract 20.