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x in (-oo:+oo)
x/2 = 2.2 // - 2.2
x/2-2.2 = 0
1/2*x-2.2 = 0 // + 2.2
1/2*x = 2.2 // : 1/2
x = 2.2/1/2
x = 4.4
x = 4.4
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