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x in (-oo:+oo)
X^2 = (-3/7)*x // - (-3/7)*x
X^2-((-3/7)*x) = 0
X^2+(3/7)*x = 0
X^2+3/7*x = 0 // - X^2
3/7*x = -X^2 // : 3/7
x = (-X^2)/3/7
x = 7/3*X^2
x = 7/3*X^2
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