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a in (-oo:+oo)
a/7.4 = 679 // - 679
a/7.4-679 = 0
0.13513514*a-679 = 0 // + 679
0.13513514*a = 679 // : 0.13513514
a = 679/0.13513514
a = 5024.59981911
a = 5024.59981911
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