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a in (-oo:+oo)
(1/3)*(a-5) = 2 // - 2
(1/3)*(a-5)-2 = 0
1/3*(a-5)-2 = 0
1/3*(a-5)-2 = 0
1/3*a-11/3 = 0
1/3*a-11/3 = 0
1/3*a-11/3 = 0 // + 11/3
1/3*a = 11/3 // : 1/3
a = 11/3/1/3
a = 11
a = 11
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