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a in (-oo:+oo)
a/(-2.8) = -2.2 // + 2.2
a/(-2.8)+2.2 = 0
2.2-0.35714286*a = 0 // - 2.2
-0.35714286*a = -2.2 // : -0.35714286
a = -2.2/(-0.35714286)
a = 6.15999995
a = 6.15999995
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