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