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x in (-oo:+oo)
(-7/13)*x = 5/26 // - 5/26
(-7/13)*x-(5/26) = 0
(-7/13)*x-5/26 = 0
-7/13*x-5/26 = 0 // + 5/26
-7/13*x = 5/26 // : -7/13
x = 5/26/(-7/13)
x = -5/14
x = -5/14
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