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Simplifying 20 + -7z = -6z Solving 20 + -7z = -6z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '6z' to each side of the equation. 20 + -7z + 6z = -6z + 6z Combine like terms: -7z + 6z = -1z 20 + -1z = -6z + 6z Combine like terms: -6z + 6z = 0 20 + -1z = 0 Add '-20' to each side of the equation. 20 + -20 + -1z = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -1z = 0 + -20 -1z = 0 + -20 Combine like terms: 0 + -20 = -20 -1z = -20 Divide each side by '-1'. z = 20 Simplifying z = 20
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