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a in (-oo:+oo)
7.02-a/8.06+18.4 = 0
25.42-0.12406948*a = 0 // - 25.42
-0.12406948*a = -25.42 // : -0.12406948
a = -25.42/(-0.12406948)
a = 204.8851982
a = 204.8851982
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