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x in (-oo:+oo)
3*x+9/10 = 29/10 // - 29/10
3*x+9/10-(29/10) = 0
3*x+9/10-29/10 = 0
3*x-2 = 0 // + 2
3*x = 2 // : 3
x = 2/3
x = 2/3
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