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x in (-oo:+oo)
x/9 = 3/10 // - 3/10
x/9-(3/10) = 0
x/9-3/10 = 0
1/9*x-3/10 = 0 // + 3/10
1/9*x = 3/10 // : 1/9
x = 3/10/1/9
x = 27/10
x = 27/10
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