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a in (-oo:+oo)
(6.5/3)*a = 19.5 // - 19.5
(6.5/3)*a-19.5 = 0
2.16666667*a-19.5 = 0 // + 19.5
2.16666667*a = 19.5 // : 2.16666667
a = 19.5/2.16666667
a = 8.99999999
a = 8.99999999
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