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x in (-oo:+oo)
x/2.1 = 5 // - 5
x/2.1-5 = 0
0.47619048*x-5 = 0 // + 5
0.47619048*x = 5 // : 0.47619048
x = 5/0.47619048
x = 10.49999992
x = 10.49999992
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