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x in (-oo:+oo)
x/8 = x+3/10 // - x+3/10
x/8-x-(3/10) = 0
x/8-x-3/10 = 0
-7/8*x-3/10 = 0 // + 3/10
-7/8*x = 3/10 // : -7/8
x = 3/10/(-7/8)
x = -12/35
x = -12/35
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