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15-y=7y+18
-y-7y=18-15
-8y=3
(15 - y)² = (7y + 17)²
(15 - y)² - (7y + 18)² = 0
(15 - y + 7y + 18)(15 - y - 7y - 18) = 0
(6y + 33)(-8y - 3) = 0
6y + 33 = 0
6y = -33
y = -33/6
y = - 5 3/6
y = -5 1/2
-8y - 3 = 0
-8y = 3
y = -3/8