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x in (-oo:+oo)
(1/4)*x+(2/5)*x = 39 // - 39
(1/4)*x+(2/5)*x-39 = 0
13/20*x-39 = 0 // + 39
13/20*x = 39 // : 13/20
x = 39/13/20
x = 60
x = 60
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