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Simplifying 13 = 1 + -1(-3z) Remove parenthesis around (-3z) 13 = 1 + -1 * -3z Multiply -1 * -3 13 = 1 + 3z Solving 13 = 1 + 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. 13 + -3z = 1 + 3z + -3z Combine like terms: 3z + -3z = 0 13 + -3z = 1 + 0 13 + -3z = 1 Add '-13' to each side of the equation. 13 + -13 + -3z = 1 + -13 Combine like terms: 13 + -13 = 0 0 + -3z = 1 + -13 -3z = 1 + -13 Combine like terms: 1 + -13 = -12 -3z = -12 Divide each side by '-3'. z = 4 Simplifying z = 4
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