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a in (-oo:+oo)
2*a-(7/3) = 7 // - 7
2*a-(7/3)-7 = 0
2*a-7/3-7 = 0
2*a-28/3 = 0 // + 28/3
2*a = 28/3 // : 2
a = 28/3/2
a = 14/3
a = 14/3
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