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z in (-oo:+oo)
3/7-(z/4) = 9/8 // - 9/8
3/7-(z/4)-(9/8) = 0
3/7-(z/4)-9/8 = 0
-1/4*z-39/56 = 0 // + 39/56
-1/4*z = 39/56 // : -1/4
z = 39/56/(-1/4)
z = -39/14
z = -39/14
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