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a in (-oo:+oo)
3*a = 45/2 // - 45/2
3*a-(45/2) = 0
3*a-45/2 = 0
3*a-45/2 = 0 // + 45/2
3*a = 45/2 // : 3
a = 45/2/3
a = 15/2
a = 15/2
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