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x in (-oo:+oo)
x/26 = 15/78 // - 15/78
x/26-(15/78) = 0
x/26-5/26 = 0
1/26*x-5/26 = 0 // + 5/26
1/26*x = 5/26 // : 1/26
x = 5/26/1/26
x = 5
x = 5
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