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z in (-oo:+oo)
17*z-((20/42)*(2-1)) = 0
17*z+(-10/21)*(2-1) = 0
17*z-10/21 = 0 // + 10/21
17*z = 10/21 // : 17
z = 10/21/17
z = 10/357
z = 10/357
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