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a in (-oo:+oo)
5-(7*a) = 22/3 // - 22/3
5-(7*a)-(22/3) = 0
5-7*a-22/3 = 0
-7*a-7/3 = 0 // + 7/3
-7*a = 7/3 // : -7
a = 7/3/(-7)
a = -1/3
a = -1/3
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