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x in (-oo:+oo)
x/8 = 89/10 // - 89/10
x/8-(89/10) = 0
x/8-89/10 = 0
1/8*x-89/10 = 0 // + 89/10
1/8*x = 89/10 // : 1/8
x = 89/10/1/8
x = 356/5
x = 356/5
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