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Simplifying 7 + -7z = -8z Solving 7 + -7z = -8z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '8z' to each side of the equation. 7 + -7z + 8z = -8z + 8z Combine like terms: -7z + 8z = 1z 7 + 1z = -8z + 8z Combine like terms: -8z + 8z = 0 7 + 1z = 0 Add '-7' to each side of the equation. 7 + -7 + 1z = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 1z = 0 + -7 1z = 0 + -7 Combine like terms: 0 + -7 = -7 1z = -7 Divide each side by '1'. z = -7 Simplifying z = -7
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