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y*((7*x-(4*y))/8) = 0
y*((7*x-4*y)/8) = 0
(y*(7*x-4*y))/8 = 0
7*x-4*y = 0 // + -4*y
7*x = -(-4*y) // : 7
x = (-(-4*y))/7
x = (4*y)/7
x = (4*y)/7
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