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((1/3)*x-((2/5)*y))^2 = 0
((1/3)*x+(-2/5)*y)^2 = 0
(1/3*x-2/5*y)^2 = 0
1/3*x-2/5*y = 0 // + -2/5*y
1/3*x = -(-2/5*y) // : 1/3
x = (-(-2/5*y))/1/3
x = 6/5*y
x in { 6/5*y, 6/5*y }
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