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