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a in (-oo:+oo)
a-4*a+2/9 = -79/9 // + -79/9
a-4*a+2/9-(-79/9) = 0
a-4*a+2/9+79/9 = 0
9-3*a = 0 // - 9
-3*a = -9 // : -3
a = -9/(-3)
a = 3
a = 3
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