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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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