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a in (-oo:+oo)
7*a-((3/7)*a)+9 = 935/63 // - 935/63
7*a-((3/7)*a)-(935/63)+9 = 0
7*a+(-3/7)*a-935/63+9 = 0
46/7*a-368/63 = 0 // + 368/63
46/7*a = 368/63 // : 46/7
a = 368/63/46/7
a = 8/9
a = 8/9
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