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Simplifying 3z + z + -40 = 90 Reorder the terms: -40 + 3z + z = 90 Combine like terms: 3z + z = 4z -40 + 4z = 90 Solving -40 + 4z = 90 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + 4z = 90 + 40 Combine like terms: -40 + 40 = 0 0 + 4z = 90 + 40 4z = 90 + 40 Combine like terms: 90 + 40 = 130 4z = 130 Divide each side by '4'. z = 32.5 Simplifying z = 32.5
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