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x in (-oo:+oo)
x-((8/2)*x) = -10 // + 10
x-((8/2)*x)+10 = 0
x-4*x+10 = 0
10-3*x = 0 // - 10
-3*x = -10 // : -3
x = -10/(-3)
x = 10/3
x = 10/3
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