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z in (-oo:+oo)
(3/7)*(2*z-5) = (4/7)*(9-3*z) // - (4/7)*(9-3*z)
(3/7)*(2*z-5)-((4/7)*(9-3*z)) = 0
(3/7)*(2*z-5)+(-4/7)*(9-3*z) = 0
3/7*(2*z-5)-4/7*(9-3*z) = 0
3/7*(2*z-5)-4/7*(9-3*z) = 0
18/7*z-51/7 = 0
18/7*z-51/7 = 0
18/7*z-51/7 = 0 // + 51/7
18/7*z = 51/7 // : 18/7
z = 51/7/18/7
z = 17/6
z = 17/6
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