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a in (-oo:+oo)
2*a+(16/5)*a = 52/15 // - 52/15
2*a+(16/5)*a-(52/15) = 0
2*a+(16/5)*a-52/15 = 0
26/5*a-52/15 = 0 // + 52/15
26/5*a = 52/15 // : 26/5
a = 52/15/26/5
a = 2/3
a = 2/3
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