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a in (-oo:+oo)
9 = a/1.5 // - a/1.5
9-(a/1.5) = 0
9-0.66666667*a = 0
9-0.66666667*a = 0 // - 9
-0.66666667*a = -9 // : -0.66666667
a = -9/(-0.66666667)
a = 13.49999993
a = 13.49999993
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