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z in (-oo:+oo)
(8*z)/7-3*z+9/9 = 9/8-10*z // - 9/8-10*z
(8*z)/7-3*z-(-10*z)+9/9-(9/8) = 0
(8*z)/7-3*z+10*z+9/9-9/8 = 0
57/7*z-1/8 = 0 // + 1/8
57/7*z = 1/8 // : 57/7
z = 1/8/57/7
z = 7/456
z = 7/456
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