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(1/2)*(16*z+12)-1 = 7*(z-4) // - 7*(z-4)
(1/2)*(16*z+12)-(7*(z-4))-1 = 0
(1/2)*(16*z+12)-7*(z-4)-1 = 0
1/2*(16*z+12)-7*(z-4)-1 = 0
1/2*(16*z+12)-7*(z-4)-1 = 0
z-1+34 = 0
z+33 = 0
z+33 = 0
z+33 = 0 // - 33
z = -33
z = -33
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