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a in (-oo:+oo)
(2/3)*a+1 = 10 // - 10
(2/3)*a-10+1 = 0
2/3*a-9 = 0 // + 9
2/3*a = 9 // : 2/3
a = 9/2/3
a = 27/2
a = 27/2
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