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