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x in (-oo:+oo)
3*x = -13/3 // + -13/3
3*x-(-13/3) = 0
3*x+13/3 = 0
3*x+13/3 = 0 // - 13/3
3*x = -13/3 // : 3
x = -13/3/3
x = -13/9
x = -13/9
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