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a in (-oo:+oo)
7*a-((6/7)*a)-5/9 = 352/63 // - 352/63
7*a-((6/7)*a)-5/9-(352/63) = 0
(-6/7)*a+7*a-5/9-352/63 = 0
43/7*a-43/7 = 0 // + 43/7
43/7*a = 43/7 // : 43/7
a = 43/7/43/7
a = 1
a = 1
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