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Simplifying 5z + (2z + -7) = 63 Reorder the terms: 5z + (-7 + 2z) = 63 Remove parenthesis around (-7 + 2z) 5z + -7 + 2z = 63 Reorder the terms: -7 + 5z + 2z = 63 Combine like terms: 5z + 2z = 7z -7 + 7z = 63 Solving -7 + 7z = 63 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 + 7z = 63 + 7 Combine like terms: -7 + 7 = 0 0 + 7z = 63 + 7 7z = 63 + 7 Combine like terms: 63 + 7 = 70 7z = 70 Divide each side by '7'. z = 10 Simplifying z = 10
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