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26*a+2*a-5.5 = 9/13+20/13+4/13 // - 9/13+20/13+4/13
26*a+2*a-(9/13)-(20/13)-(4/13)-5.5 = 0
26*a+2*a-9/13-20/13-4/13-5.5 = 0
28*a-8.03846154 = 0 // + 8.03846154
28*a = 8.03846154 // : 28
a = 8.03846154/28
a = 0.28708791
a = 0.28708791
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