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Simplifying 3z + -1(2z + -7) = 15 Reorder the terms: 3z + -1(-7 + 2z) = 15 3z + (-7 * -1 + 2z * -1) = 15 3z + (7 + -2z) = 15 Reorder the terms: 7 + 3z + -2z = 15 Combine like terms: 3z + -2z = 1z 7 + 1z = 15 Solving 7 + 1z = 15 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 1z = 15 + -7 Combine like terms: 7 + -7 = 0 0 + 1z = 15 + -7 1z = 15 + -7 Combine like terms: 15 + -7 = 8 1z = 8 Divide each side by '1'. z = 8 Simplifying z = 8
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