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