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a in (-oo:+oo)
-7*a-9 = -46/9 // + -46/9
-7*a-(-46/9)-9 = 0
46/9-7*a-9 = 0
-7*a-35/9 = 0 // + 35/9
-7*a = 35/9 // : -7
a = 35/9/(-7)
a = -5/9
a = -5/9
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