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