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z in (-oo:+oo)
(1/4)*z-(2/7) = 5/7 // - 5/7
(1/4)*z-(2/7)-(5/7) = 0
(1/4)*z-2/7-5/7 = 0
1/4*z-1 = 0 // + 1
1/4*z = 1 // : 1/4
z = 1/1/4
z = 4
z = 4
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