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Simplifying 2z + -31 = -9(z + 20) Reorder the terms: -31 + 2z = -9(z + 20) Reorder the terms: -31 + 2z = -9(20 + z) -31 + 2z = (20 * -9 + z * -9) -31 + 2z = (-180 + -9z) Solving -31 + 2z = -180 + -9z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '9z' to each side of the equation. -31 + 2z + 9z = -180 + -9z + 9z Combine like terms: 2z + 9z = 11z -31 + 11z = -180 + -9z + 9z Combine like terms: -9z + 9z = 0 -31 + 11z = -180 + 0 -31 + 11z = -180 Add '31' to each side of the equation. -31 + 31 + 11z = -180 + 31 Combine like terms: -31 + 31 = 0 0 + 11z = -180 + 31 11z = -180 + 31 Combine like terms: -180 + 31 = -149 11z = -149 Divide each side by '11'. z = -13.54545455 Simplifying z = -13.54545455
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