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x in (-oo:+oo)
x+4*x+9/10 = -31/10 // + -31/10
x+4*x+9/10-(-31/10) = 0
x+4*x+9/10+31/10 = 0
5*x+4 = 0 // - 4
5*x = -4 // : 5
x = -4/5
x = -4/5
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