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x in (-oo:+oo)
(2/3)*x+1 = x-4 // - x-4
(2/3)*x-x+1+4 = 0
5-1/3*x = 0 // - 5
-1/3*x = -5 // : -1/3
x = -5/(-1/3)
x = 15
x = 15
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