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z in (-oo:+oo)
(1/4)*(20*z+3) = (3/4)*(8*z+1) // - (3/4)*(8*z+1)
(1/4)*(20*z+3)-((3/4)*(8*z+1)) = 0
(1/4)*(20*z+3)+(-3/4)*(8*z+1) = 0
1/4*(20*z+3)-3/4*(8*z+1) = 0
1/4*(20*z+3)-3/4*(8*z+1) = 0
-z = 0
-z = 0
-1*z = 0 // : -1
z = 0
z = 0
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