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x in (-oo:+oo)
7/8-(1*x) = 13/8 // - 13/8
7/8-(1*x)-(13/8) = 0
7/8-x-13/8 = 0
-x-3/4 = 0 // + 3/4
-x = 3/4 // * -1
x = -3/4
x = -3/4
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