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a in (-oo:+oo)
3*a+6/4 = 15 // - 15
3*a+6/4-15 = 0
3*a-27/2 = 0 // + 27/2
3*a = 27/2 // : 3
a = 27/2/3
a = 9/2
a = 9/2
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