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x in (-oo:+oo)
2/5-(x/2)-10 = -4 // + 4
2/5-(x/2)-10+4 = 0
-1/2*x-28/5 = 0 // + 28/5
-1/2*x = 28/5 // : -1/2
x = 28/5/(-1/2)
x = -56/5
x = -56/5
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