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x in (-oo:+oo)
8-((1/5)*x) = 13 // - 13
8-((1/5)*x)-13 = 0
(-1/5)*x-13+8 = 0
-1/5*x-5 = 0 // + 5
-1/5*x = 5 // : -1/5
x = 5/(-1/5)
x = -25
x = -25
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