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x in (-oo:+oo)
(2*x)/5-(x/2) = 50 // - 50
(2*x)/5-(x/2)-50 = 0
-1/10*x-50 = 0 // + 50
-1/10*x = 50 // : -1/10
x = 50/(-1/10)
x = -500
x = -500
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