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Simplifying -21 = 3z + -19 Reorder the terms: -21 = -19 + 3z Solving -21 = -19 + 3z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-3z' to each side of the equation. -21 + -3z = -19 + 3z + -3z Combine like terms: 3z + -3z = 0 -21 + -3z = -19 + 0 -21 + -3z = -19 Add '21' to each side of the equation. -21 + 21 + -3z = -19 + 21 Combine like terms: -21 + 21 = 0 0 + -3z = -19 + 21 -3z = -19 + 21 Combine like terms: -19 + 21 = 2 -3z = 2 Divide each side by '-3'. z = -0.6666666667 Simplifying z = -0.6666666667
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