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x in (-oo:+oo)
3*x+1 = -19/11 // + -19/11
3*x-(-19/11)+1 = 0
3*x+19/11+1 = 0
3*x+30/11 = 0 // - 30/11
3*x = -30/11 // : 3
x = -30/11/3
x = -10/11
x = -10/11
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