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x in (-oo:+oo)
(1/5)*x+(1/4)*x = 18 // - 18
(1/5)*x+(1/4)*x-18 = 0
9/20*x-18 = 0 // + 18
9/20*x = 18 // : 9/20
x = 18/9/20
x = 40
x = 40
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