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a in (-oo:+oo)
5-(a/8) = 0.57142857142 // - 0.57142857142
5-(a/8)-0.57142857142 = 0
4.42857142858-1/8*a = 0 // - 4.42857142858
-1/8*a = -4.42857142858 // : -1/8
a = -4.42857142858/(-1/8)
a = 35.42857143
a = 35.42857143
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