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x in (-oo:+oo)
x/10 = 2.21 // - 2.21
x/10-2.21 = 0
1/10*x-2.21 = 0 // + 2.21
1/10*x = 2.21 // : 1/10
x = 2.21/1/10
x = 22.1
x = 22.1
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