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x in (-oo:+oo)
-x-5 = -43/8 // + -43/8
-x-(-43/8)-5 = 0
43/8-x-5 = 0
3/8-x = 0 // - 3/8
-x = -3/8 // * -1
x = 3/8
x = 3/8
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