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a in (-oo:+oo)
(2/3)*(a-16) = -9 // + 9
(2/3)*(a-16)+9 = 0
2/3*(a-16)+9 = 0
2/3*(a-16)+9 = 0
2/3*a-5/3 = 0
2/3*a-5/3 = 0
2/3*a-5/3 = 0 // + 5/3
2/3*a = 5/3 // : 2/3
a = 5/3/2/3
a = 5/2
a = 5/2
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