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x in (-oo:+oo)
x/11-7 = 21/22 // - 21/22
x/11-(21/22)-7 = 0
x/11-21/22-7 = 0
1/11*x-175/22 = 0 // + 175/22
1/11*x = 175/22 // : 1/11
x = 175/22/1/11
x = 175/2
x = 175/2
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