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x in (-oo:+oo)
6*x+3 = -9/11 // + -9/11
6*x-(-9/11)+3 = 0
6*x+9/11+3 = 0
6*x+42/11 = 0 // - 42/11
6*x = -42/11 // : 6
x = -42/11/6
x = -7/11
x = -7/11
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