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a in (-oo:+oo)
a/2.1 = 6 // - 6
a/2.1-6 = 0
0.47619048*a-6 = 0 // + 6
0.47619048*a = 6 // : 0.47619048
a = 6/0.47619048
a = 12.5999999
a = 12.5999999
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