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x in (-oo:+oo)
-x = -a/13 // + -a/13
-(-a/13)-x = 0
(1/13)*a-x = 0
1/13*a-x = 0 // - 1/13*a
-x = -(1/13*a) // * -1
x = 1/13*a
x = 1/13*a
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