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Simplifying 90 = -5(3z) Remove parenthesis around (3z) 90 = -5 * 3z Multiply -5 * 3 90 = -15z Solving 90 = -15z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '15z' to each side of the equation. 90 + 15z = -15z + 15z Combine like terms: -15z + 15z = 0 90 + 15z = 0 Add '-90' to each side of the equation. 90 + -90 + 15z = 0 + -90 Combine like terms: 90 + -90 = 0 0 + 15z = 0 + -90 15z = 0 + -90 Combine like terms: 0 + -90 = -90 15z = -90 Divide each side by '15'. z = -6 Simplifying z = -6
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