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x in (-oo:+oo)
-((5/4)*x)-2 = 13 // - 13
-((5/4)*x)-13-2 = 0
(-5/4)*x-13-2 = 0
-5/4*x-15 = 0 // + 15
-5/4*x = 15 // : -5/4
x = 15/(-5/4)
x = -12
x = -12
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