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a in (-oo:+oo)
a/2.7 = 84 // - 84
a/2.7-84 = 0
0.37037037*a-84 = 0 // + 84
0.37037037*a = 84 // : 0.37037037
a = 84/0.37037037
a = 226.80000023
a = 226.80000023
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