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a in (-oo:+oo)
1/9-7*a = -314/9 // + -314/9
1/9-7*a-(-314/9) = 0
1/9-7*a+314/9 = 0
35-7*a = 0 // - 35
-7*a = -35 // : -7
a = -35/(-7)
a = 5
a = 5
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