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x in (-oo:+oo)
x/5-4 = x/2 // - x/2
x/5-(x/2)-4 = 0
-3/10*x-4 = 0 // + 4
-3/10*x = 4 // : -3/10
x = 4/(-3/10)
x = -40/3
x = -40/3
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