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x in (-oo:+oo)
-x = (2/3)*x+10 // - (2/3)*x+10
-x-((2/3)*x)-10 = 0
(-2/3)*x-x-10 = 0
-5/3*x-10 = 0 // + 10
-5/3*x = 10 // : -5/3
x = 10/(-5/3)
x = -6
x = -6
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