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(15*y+3/5)*(15*x-(4*y)) = 0
(15*y+3/5)*(15*x-4*y) = 0
15*x-4*y = 0 // + -4*y
15*x = -(-4*y) // : 15
x = (-(-4*y))/15
x = (4*y)/15
x = (4*y)/15
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