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x in (-oo:+oo)
-8 = x/5-7 // - x/5-7
7-(x/5)-8 = 0
-1/5*x-1 = 0 // + 1
-1/5*x = 1 // : -1/5
x = 1/(-1/5)
x = -5
x = -5
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