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x in (-oo:+oo)
((3/7)*x-(14*y))^2 = 0
((3/7)*x-14*y)^2 = 0
(3/7*x-14*y)^2 = 0
3/7*x-14*y = 0 // + -14*y
3/7*x = -(-14*y) // : 3/7
x = (-(-14*y))/3/7
x = 98/3*y
x in { 98/3*y, 98/3*y }
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