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y*((14*x-(7*y))/7) = 0
y*((14*x-7*y)/7) = 0
(y*(14*x-7*y))/7 = 0
14*x-7*y = 0 // + -7*y
14*x = -(-7*y) // : 14
x = (-(-7*y))/14
x = y/2
x = y/2
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