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a in (-oo:+oo)
a/8 = 5.4 // - 5.4
a/8-5.4 = 0
1/8*a-5.4 = 0 // + 5.4
1/8*a = 5.4 // : 1/8
a = 5.4/1/8
a = 43.2
a = 43.2
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