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z in (-oo:+oo)
(1/6)*(z+1) = 7 // - 7
(1/6)*(z+1)-7 = 0
1/6*(z+1)-7 = 0
1/6*(z+1)-7 = 0
1/6*z-41/6 = 0
1/6*z-41/6 = 0
1/6*z-41/6 = 0 // + 41/6
1/6*z = 41/6 // : 1/6
z = 41/6/1/6
z = 41
z = 41
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