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x in (-oo:+oo)
5*x+2/9 = -166/63 // + -166/63
5*x+2/9-(-166/63) = 0
5*x+2/9+166/63 = 0
5*x+20/7 = 0 // - 20/7
5*x = -20/7 // : 5
x = -20/7/5
x = -4/7
x = -4/7
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