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x in (-oo:+oo)
7*x+9 = 57/11 // - 57/11
7*x-(57/11)+9 = 0
7*x-57/11+9 = 0
7*x+42/11 = 0 // - 42/11
7*x = -42/11 // : 7
x = -42/11/7
x = -6/11
x = -6/11
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