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x in (-oo:+oo)
5*x+9/10 = -251/110 // + -251/110
5*x+9/10-(-251/110) = 0
5*x+9/10+251/110 = 0
5*x+35/11 = 0 // - 35/11
5*x = -35/11 // : 5
x = -35/11/5
x = -7/11
x = -7/11
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