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a in (-oo:+oo)
3/4-7*a = -193/4 // + -193/4
3/4-7*a-(-193/4) = 0
3/4-7*a+193/4 = 0
49-7*a = 0 // - 49
-7*a = -49 // : -7
a = -49/(-7)
a = 7
a = 7
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