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x in (-oo:+oo)
x/10 = 30.5/210 // - 30.5/210
x/10-(30.5/210) = 0
x/10-0.1452381 = 0
1/10*x-0.1452381 = 0 // + 0.1452381
1/10*x = 0.1452381 // : 1/10
x = 0.1452381/1/10
x = 1.452381
x = 1.452381
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