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a in (-oo:+oo)
3/7-5*a = -137/7 // + -137/7
3/7-5*a-(-137/7) = 0
3/7-5*a+137/7 = 0
20-5*a = 0 // - 20
-5*a = -20 // : -5
a = -20/(-5)
a = 4
a = 4
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