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Simplifying -20 + -13z = 20 + 7z Solving -20 + -13z = 20 + 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. -20 + -13z + -7z = 20 + 7z + -7z Combine like terms: -13z + -7z = -20z -20 + -20z = 20 + 7z + -7z Combine like terms: 7z + -7z = 0 -20 + -20z = 20 + 0 -20 + -20z = 20 Add '20' to each side of the equation. -20 + 20 + -20z = 20 + 20 Combine like terms: -20 + 20 = 0 0 + -20z = 20 + 20 -20z = 20 + 20 Combine like terms: 20 + 20 = 40 -20z = 40 Divide each side by '-20'. z = -2 Simplifying z = -2
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