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Simplifying (12z + -1) + (6z + -1) + 90 = 180 Reorder the terms: (-1 + 12z) + (6z + -1) + 90 = 180 Remove parenthesis around (-1 + 12z) -1 + 12z + (6z + -1) + 90 = 180 Reorder the terms: -1 + 12z + (-1 + 6z) + 90 = 180 Remove parenthesis around (-1 + 6z) -1 + 12z + -1 + 6z + 90 = 180 Reorder the terms: -1 + -1 + 90 + 12z + 6z = 180 Combine like terms: -1 + -1 = -2 -2 + 90 + 12z + 6z = 180 Combine like terms: -2 + 90 = 88 88 + 12z + 6z = 180 Combine like terms: 12z + 6z = 18z 88 + 18z = 180 Solving 88 + 18z = 180 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-88' to each side of the equation. 88 + -88 + 18z = 180 + -88 Combine like terms: 88 + -88 = 0 0 + 18z = 180 + -88 18z = 180 + -88 Combine like terms: 180 + -88 = 92 18z = 92 Divide each side by '18'. z = 5.111111111 Simplifying z = 5.111111111
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