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x in (-oo:+oo)
-x/5-((2/8)*x) = 2 // - 2
-x/5-((2/8)*x)-2 = 0
(-1/4)*x-x/5-2 = 0
-9/20*x-2 = 0 // + 2
-9/20*x = 2 // : -9/20
x = 2/(-9/20)
x = -40/9
x = -40/9
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