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z in (-oo:+oo)
4*z-(3/7) = -2/3 // + -2/3
4*z-(3/7)-(-2/3) = 0
4*z-3/7+2/3 = 0
4*z+5/21 = 0 // - 5/21
4*z = -5/21 // : 4
z = -5/21/4
z = -5/84
z = -5/84
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