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Simplifying -1(7z + -1(12z + 10)) = 10 + (4z + 9) Reorder the terms: -1(7z + -1(10 + 12z)) = 10 + (4z + 9) -1(7z + (10 * -1 + 12z * -1)) = 10 + (4z + 9) -1(7z + (-10 + -12z)) = 10 + (4z + 9) Reorder the terms: -1(-10 + 7z + -12z) = 10 + (4z + 9) Combine like terms: 7z + -12z = -5z -1(-10 + -5z) = 10 + (4z + 9) (-10 * -1 + -5z * -1) = 10 + (4z + 9) (10 + 5z) = 10 + (4z + 9) Reorder the terms: 10 + 5z = 10 + (9 + 4z) Remove parenthesis around (9 + 4z) 10 + 5z = 10 + 9 + 4z Combine like terms: 10 + 9 = 19 10 + 5z = 19 + 4z Solving 10 + 5z = 19 + 4z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-4z' to each side of the equation. 10 + 5z + -4z = 19 + 4z + -4z Combine like terms: 5z + -4z = 1z 10 + 1z = 19 + 4z + -4z Combine like terms: 4z + -4z = 0 10 + 1z = 19 + 0 10 + 1z = 19 Add '-10' to each side of the equation. 10 + -10 + 1z = 19 + -10 Combine like terms: 10 + -10 = 0 0 + 1z = 19 + -10 1z = 19 + -10 Combine like terms: 19 + -10 = 9 1z = 9 Divide each side by '1'. z = 9 Simplifying z = 9
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