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x in (-oo:+oo)
(1/4)*x+(1/5)*x = 58 // - 58
(1/4)*x+(1/5)*x-58 = 0
9/20*x-58 = 0 // + 58
9/20*x = 58 // : 9/20
x = 58/9/20
x = 1160/9
x = 1160/9
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