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x in (-oo:+oo)
3*x = -1/10 // + -1/10
3*x-(-1/10) = 0
3*x+1/10 = 0
3*x+1/10 = 0 // - 1/10
3*x = -1/10 // : 3
x = -1/10/3
x = -1/30
x = -1/30
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