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x in (-oo:+oo)
(1/3)*x-(1/3) = -3 // + 3
(1/3)*x-(1/3)+3 = 0
(1/3)*x-1/3+3 = 0
1/3*x+8/3 = 0 // - 8/3
1/3*x = -8/3 // : 1/3
x = -8/3/1/3
x = -8
x = -8
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