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x in (-oo:+oo)
-13 = (-5*x)/2 // - (-5*x)/2
-((-5*x)/2)-13 = 0
(5/2)*x-13 = 0
5/2*x-13 = 0 // + 13
5/2*x = 13 // : 5/2
x = 13/5/2
x = 26/5
x = 26/5
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