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x in (-oo:+oo)
65/80 = x/10 // - x/10
65/80-(x/10) = 0
13/16-1/10*x = 0 // - 13/16
-1/10*x = -13/16 // : -1/10
x = -13/16/(-1/10)
x = 65/8
x = 65/8
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