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((3/5)*x-((10/9)*y))^2 = 0
((3/5)*x+(-10/9)*y)^2 = 0
(3/5*x-10/9*y)^2 = 0
3/5*x-10/9*y = 0 // + -10/9*y
3/5*x = -(-10/9*y) // : 3/5
x = (-(-10/9*y))/3/5
x = 50/27*y
x in { 50/27*y, 50/27*y }
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