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a in (-oo:+oo)
-a/5.2 = -7 // + 7
7-a/5.2 = 0
7-0.19230769*a = 0 // - 7
-0.19230769*a = -7 // : -0.19230769
a = -7/(-0.19230769)
a = 36.40000044
a = 36.40000044
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