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Simplifying 3z * 7 + -2 = -4 Reorder the terms for easier multiplication: 3 * 7z + -2 = -4 Multiply 3 * 7 21z + -2 = -4 Reorder the terms: -2 + 21z = -4 Solving -2 + 21z = -4 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 21z = -4 + 2 Combine like terms: -2 + 2 = 0 0 + 21z = -4 + 2 21z = -4 + 2 Combine like terms: -4 + 2 = -2 21z = -2 Divide each side by '21'. z = -0.09523809524 Simplifying z = -0.09523809524
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