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x + y = 75,000
x - y = 5,000 ⇒ x - 35,000 = 5,000
_______________ - x = 40,000
2y = 70,000
y = 35,000
x + y = 75,000
x - y = 5,000 ⇒ x - 35,000 = 5,000
_______________ - x = 40,000
2y = 70,000
y = 35,000