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a in (-oo:+oo)
8/9-7*a = -47/18 // + -47/18
8/9-7*a-(-47/18) = 0
8/9-7*a+47/18 = 0
7/2-7*a = 0 // - 7/2
-7*a = -7/2 // : -7
a = -7/2/(-7)
a = 1/2
a = 1/2
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