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a in (-oo:+oo)
3/2 = a+3/4 // - a+3/4
3/2-a-(3/4) = 0
3/2-a-3/4 = 0
3/4-a = 0 // - 3/4
-a = -3/4 // * -1
a = 3/4
a = 3/4
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