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x in (-oo:+oo)
(2*x)/5+4+4 = x/2 // - x/2
(2*x)/5-(x/2)+4+4 = 0
8-1/10*x = 0 // - 8
-1/10*x = -8 // : -1/10
x = -8/(-1/10)
x = 80
x = 80
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