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