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a in (-oo:+oo)
-5*a-1 = 2*a-22 // - 2*a-22
22-5*a-(2*a)-1 = 0
22-5*a-2*a-1 = 0
21-7*a = 0 // - 21
-7*a = -21 // : -7
a = -21/(-7)
a = 3
a = 3
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