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Simplifying 2z + -1(4 + -1z) + -9 = -7 2z + (4 * -1 + -1z * -1) + -9 = -7 2z + (-4 + 1z) + -9 = -7 Reorder the terms: -4 + -9 + 2z + 1z = -7 Combine like terms: -4 + -9 = -13 -13 + 2z + 1z = -7 Combine like terms: 2z + 1z = 3z -13 + 3z = -7 Solving -13 + 3z = -7 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + 3z = -7 + 13 Combine like terms: -13 + 13 = 0 0 + 3z = -7 + 13 3z = -7 + 13 Combine like terms: -7 + 13 = 6 3z = 6 Divide each side by '3'. z = 2 Simplifying z = 2
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