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(y^2-(4*x))/7-4 = 0
(y^2-4*x)/7-4 = 0
(y^2-4*x)/7+(-4*7)/7 = 0
y^2-4*x-4*7 = 0
y^2-4*x-28 = 0
(y^2-4*x-28)/7 = 0
(y^2-4*x-28)/7 = 0 // * 7
y^2-4*x-28 = 0
y^2-4*x-28 = 0 // - y^2-28
-4*x = -(y^2-28) // : -4
x = (-(y^2-28))/(-4)
x = (28-y^2)/(-4)
x = (28-y^2)/(-4)
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