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x in (-oo:+oo)
Y = 10*(2/3)*x // - 10*(2/3)*x
Y-(10*(2/3)*x) = 0
Y+(-20/3)*x = 0
Y-20/3*x = 0 // - Y
-20/3*x = -Y // : -20/3
x = -Y/(-20/3)
x = 3/20*Y
x = 3/20*Y
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