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a in (-oo:+oo)
(-6/7)*a+a+5/9 = 107/63 // - 107/63
(-6/7)*a+a+5/9-(107/63) = 0
(-6/7)*a+a+5/9-107/63 = 0
1/7*a-8/7 = 0 // + 8/7
1/7*a = 8/7 // : 1/7
a = 8/7/1/7
a = 8
a = 8
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