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Simplifying -1z + 20 = z + 20 Reorder the terms: 20 + -1z = z + 20 Reorder the terms: 20 + -1z = 20 + z Add '-20' to each side of the equation. 20 + -20 + -1z = 20 + -20 + z Combine like terms: 20 + -20 = 0 0 + -1z = 20 + -20 + z -1z = 20 + -20 + z Combine like terms: 20 + -20 = 0 -1z = 0 + z -1z = z Solving -1z = z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1z' to each side of the equation. -1z + -1z = z + -1z Combine like terms: -1z + -1z = -2z -2z = z + -1z Combine like terms: z + -1z = 0 -2z = 0 Divide each side by '-2'. z = 0 Simplifying z = 0
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