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z in (-oo:+oo)
(30*z)/3 = 105/6 // - 105/6
(30*z)/3-(105/6) = 0
(30*z)/3-35/2 = 0
10*z-35/2 = 0 // + 35/2
10*z = 35/2 // : 10
z = 35/2/10
z = 7/4
z = 7/4
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