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x in (-oo:+oo)
8-x = (1/3)*x+4 // - (1/3)*x+4
8-x-((1/3)*x)-4 = 0
(-1/3)*x-x-4+8 = 0
4-4/3*x = 0 // - 4
-4/3*x = -4 // : -4/3
x = -4/(-4/3)
x = 3
x = 3
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