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x in (-oo:+oo)
x/4+(2*x)/5 = 26 // - 26
x/4+(2*x)/5-26 = 0
13/20*x-26 = 0 // + 26
13/20*x = 26 // : 13/20
x = 26/13/20
x = 40
x = 40
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