Answer:
z = -(84+51p)/(p+d)
Explanation:
-p(51+z) = dz + 84
-51p - pz = dz + 84
-pz-dz = 84 + 51p
z(-p-d) = 84 + 51p
z = 84 + 51p/[-(p+d)]
z = - (84 + 51p) / (p+d)
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