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a in (-oo:+oo)
7*a+4*a+5/9 = 599/9 // - 599/9
7*a+4*a+5/9-(599/9) = 0
7*a+4*a+5/9-599/9 = 0
11*a-66 = 0 // + 66
11*a = 66 // : 11
a = 66/11
a = 6
a = 6
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