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Simplifying -7(z + 3) + 3z = 0 Reorder the terms: -7(3 + z) + 3z = 0 (3 * -7 + z * -7) + 3z = 0 (-21 + -7z) + 3z = 0 Combine like terms: -7z + 3z = -4z -21 + -4z = 0 Solving -21 + -4z = 0 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -4z = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -4z = 0 + 21 -4z = 0 + 21 Combine like terms: 0 + 21 = 21 -4z = 21 Divide each side by '-4'. z = -5.25 Simplifying z = -5.25
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