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Simplifying -1[7z + -1(18z + 5)] = 5 + (10z + 7) Reorder the terms: -1[7z + -1(5 + 18z)] = 5 + (10z + 7) -1[7z + (5 * -1 + 18z * -1)] = 5 + (10z + 7) -1[7z + (-5 + -18z)] = 5 + (10z + 7) Reorder the terms: -1[-5 + 7z + -18z] = 5 + (10z + 7) Combine like terms: 7z + -18z = -11z -1[-5 + -11z] = 5 + (10z + 7) [-5 * -1 + -11z * -1] = 5 + (10z + 7) [5 + 11z] = 5 + (10z + 7) Reorder the terms: 5 + 11z = 5 + (7 + 10z) Remove parenthesis around (7 + 10z) 5 + 11z = 5 + 7 + 10z Combine like terms: 5 + 7 = 12 5 + 11z = 12 + 10z Solving 5 + 11z = 12 + 10z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-10z' to each side of the equation. 5 + 11z + -10z = 12 + 10z + -10z Combine like terms: 11z + -10z = 1z 5 + 1z = 12 + 10z + -10z Combine like terms: 10z + -10z = 0 5 + 1z = 12 + 0 5 + 1z = 12 Add '-5' to each side of the equation. 5 + -5 + 1z = 12 + -5 Combine like terms: 5 + -5 = 0 0 + 1z = 12 + -5 1z = 12 + -5 Combine like terms: 12 + -5 = 7 1z = 7 Divide each side by '1'. z = 7 Simplifying z = 7
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