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A in (-oo:+oo)
A/9.89 = 8.2 // - 8.2
A/9.89-8.2 = 0
0.10111223*A-8.2 = 0 // + 8.2
0.10111223*A = 8.2 // : 0.10111223
A = 8.2/0.10111223
A = 81.09800367
A = 81.09800367
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