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z in (-oo:+oo)
(4/7)*z+2/3 = 13 // - 13
(4/7)*z+2/3-13 = 0
4/7*z-37/3 = 0 // + 37/3
4/7*z = 37/3 // : 4/7
z = 37/3/4/7
z = 259/12
z = 259/12
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