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x = 7y x/7 = y
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(x + 5y)(x + 7y)
7x + 8y
(x - y + 7)(x + y)
1 + 7y = 5x - 2 7y = 5x - 3 - 5x = - 7y - 3 x = 7/5y + 3/5 ---------------------