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