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x in (-oo:+oo)
(2/3)*(3*x+1) = -4 // + 4
(2/3)*(3*x+1)+4 = 0
2/3*(3*x+1)+4 = 0
2/3*(3*x+1)+4 = 0
2*x+14/3 = 0
2*x+14/3 = 0
2*x+14/3 = 0 // - 14/3
2*x = -14/3 // : 2
x = -14/3/2
x = -7/3
x = -7/3
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