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Simplifying (z + -21) + (z + -48) = 168 Reorder the terms: (-21 + z) + (z + -48) = 168 Remove parenthesis around (-21 + z) -21 + z + (z + -48) = 168 Reorder the terms: -21 + z + (-48 + z) = 168 Remove parenthesis around (-48 + z) -21 + z + -48 + z = 168 Reorder the terms: -21 + -48 + z + z = 168 Combine like terms: -21 + -48 = -69 -69 + z + z = 168 Combine like terms: z + z = 2z -69 + 2z = 168 Solving -69 + 2z = 168 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '69' to each side of the equation. -69 + 69 + 2z = 168 + 69 Combine like terms: -69 + 69 = 0 0 + 2z = 168 + 69 2z = 168 + 69 Combine like terms: 168 + 69 = 237 2z = 237 Divide each side by '2'. z = 118.5 Simplifying z = 118.5
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