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x in (-oo:+oo)
x/8+1/7 = 11 // - 11
x/8+1/7-11 = 0
1/8*x-76/7 = 0 // + 76/7
1/8*x = 76/7 // : 1/8
x = 76/7/1/8
x = 608/7
x = 608/7
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