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x in (-oo:+oo)
x/8-4 = 15/16 // - 15/16
x/8-(15/16)-4 = 0
x/8-15/16-4 = 0
1/8*x-79/16 = 0 // + 79/16
1/8*x = 79/16 // : 1/8
x = 79/16/1/8
x = 79/2
x = 79/2
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