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