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x in (-oo:+oo)
((x+3)^1)/3+x+1 = 0
(x+3)/3+x+1 = 0
(x+3)/3+(3*x)/3+(1*3)/3 = 0
x+3*x+1*3+3 = 0
4*x+3+3 = 0
4*x+6 = 0
(4*x+6)/3 = 0
(4*x+6)/3 = 0 // * 3
4*x+6 = 0
4*x+6 = 0 // - 6
4*x = -6 // : 4
x = -6/4
x = -3/2
x = -3/2
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