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a in (-oo:+oo)
-32/63 = (-5/7)*a+a-(2/9) // - (-5/7)*a+a-(2/9)
2/9-((-5/7)*a)-a-32/63 = 0
(5/7)*a-a-32/63+2/9 = 0
-2/7*a-2/7 = 0 // + 2/7
-2/7*a = 2/7 // : -2/7
a = 2/7/(-2/7)
a = -1
a = -1
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