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x in (-oo:+oo)
-5 = (13/42)*x // - (13/42)*x
-((13/42)*x)-5 = 0
(-13/42)*x-5 = 0
-13/42*x-5 = 0 // + 5
-13/42*x = 5 // : -13/42
x = 5/(-13/42)
x = -210/13
x = -210/13
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