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x in (-oo:+oo)
x/8 = x+7/10 // - x+7/10
x/8-x-(7/10) = 0
x/8-x-7/10 = 0
-7/8*x-7/10 = 0 // + 7/10
-7/8*x = 7/10 // : -7/8
x = 7/10/(-7/8)
x = -4/5
x = -4/5
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