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z in (-oo:+oo)
(1/5)*(z-25) = 2 // - 2
(1/5)*(z-25)-2 = 0
1/5*(z-25)-2 = 0
1/5*(z-25)-2 = 0
1/5*z-7 = 0
1/5*z-7 = 0
1/5*z-7 = 0 // + 7
1/5*z = 7 // : 1/5
z = 7/1/5
z = 35
z = 35
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