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a in (-oo:+oo)
3/7 = a/4 // - a/4
3/7-(a/4) = 0
3/7-1/4*a = 0 // - 3/7
-1/4*a = -3/7 // : -1/4
a = -3/7/(-1/4)
a = 12/7
a = 12/7
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