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x in (-oo:+oo)
3*x = 9/10 // - 9/10
3*x-(9/10) = 0
3*x-9/10 = 0
3*x-9/10 = 0 // + 9/10
3*x = 9/10 // : 3
x = 9/10/3
x = 3/10
x = 3/10
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