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a in (-oo:+oo)
3*a = (12^7)/2 // - (12^7)/2
3*a-((12^7)/2) = 0
3*a-17915904 = 0 // + 17915904
3*a = 17915904 // : 3
a = 17915904/3
a = 5971968
a = 5971968
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