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z in (-oo:+oo)
(1/7)*z-1/3 = -4/21 // + -4/21
(1/7)*z-1/3-(-4/21) = 0
(1/7)*z-1/3+4/21 = 0
1/7*z-1/7 = 0 // + 1/7
1/7*z = 1/7 // : 1/7
z = 1/7/1/7
z = 1
z = 1
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