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a in (-oo:+oo)
-15 = 6-((1/3)*a) // - 6-((1/3)*a)
(1/3)*a-15-6 = 0
1/3*a-21 = 0 // + 21
1/3*a = 21 // : 1/3
a = 21/1/3
a = 63
a = 63
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