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a in (-oo:+oo)
0.6 = a/9 // - a/9
0.6-(a/9) = 0
0.6-1/9*a = 0 // - 0.6
-1/9*a = -0.6 // : -1/9
a = -0.6/(-1/9)
a = 5.40000005
a = 5.40000005
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