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