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x in (-oo:+oo)
x+(2/3)*x+1/3 = -34/3 // + -34/3
x+(2/3)*x+1/3-(-34/3) = 0
x+(2/3)*x+1/3+34/3 = 0
5/3*x+35/3 = 0 // - 35/3
5/3*x = -35/3 // : 5/3
x = -35/3/5/3
x = -7
x = -7
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