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a in (-oo:+oo)
(3*a)/12 = 640.8 // - 640.8
(3*a)/12-640.8 = 0
1/4*a-640.8 = 0 // + 640.8
1/4*a = 640.8 // : 1/4
a = 640.8/1/4
a = 2563.2
a = 2563.2
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