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x in (-oo:+oo)
(1/13)*x+8 = (3/13)*x-13 // - (3/13)*x-13
(1/13)*x-((3/13)*x)+8+13 = 0
(1/13)*x+(-3/13)*x+8+13 = 0
21-2/13*x = 0 // - 21
-2/13*x = -21 // : -2/13
x = -21/(-2/13)
x = 273/2
x = 273/2
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