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Simplifying -1[9z + -1(12z + 7)] = 7 + (2z + 6) Reorder the terms: -1[9z + -1(7 + 12z)] = 7 + (2z + 6) -1[9z + (7 * -1 + 12z * -1)] = 7 + (2z + 6) -1[9z + (-7 + -12z)] = 7 + (2z + 6) Reorder the terms: -1[-7 + 9z + -12z] = 7 + (2z + 6) Combine like terms: 9z + -12z = -3z -1[-7 + -3z] = 7 + (2z + 6) [-7 * -1 + -3z * -1] = 7 + (2z + 6) [7 + 3z] = 7 + (2z + 6) Reorder the terms: 7 + 3z = 7 + (6 + 2z) Remove parenthesis around (6 + 2z) 7 + 3z = 7 + 6 + 2z Combine like terms: 7 + 6 = 13 7 + 3z = 13 + 2z Solving 7 + 3z = 13 + 2z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-2z' to each side of the equation. 7 + 3z + -2z = 13 + 2z + -2z Combine like terms: 3z + -2z = 1z 7 + 1z = 13 + 2z + -2z Combine like terms: 2z + -2z = 0 7 + 1z = 13 + 0 7 + 1z = 13 Add '-7' to each side of the equation. 7 + -7 + 1z = 13 + -7 Combine like terms: 7 + -7 = 0 0 + 1z = 13 + -7 1z = 13 + -7 Combine like terms: 13 + -7 = 6 1z = 6 Divide each side by '1'. z = 6 Simplifying z = 6
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