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x in (-oo:+oo)
X^2 = (6/7)*x // - (6/7)*x
X^2-((6/7)*x) = 0
X^2+(-6/7)*x = 0
X^2-6/7*x = 0 // - X^2
-6/7*x = -X^2 // : -6/7
x = (-X^2)/(-6/7)
x = 7/6*X^2
x = 7/6*X^2
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