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