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Simplifying 15 + z = 4 + 5z Solving 15 + z = 4 + 5z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-5z' to each side of the equation. 15 + z + -5z = 4 + 5z + -5z Combine like terms: z + -5z = -4z 15 + -4z = 4 + 5z + -5z Combine like terms: 5z + -5z = 0 15 + -4z = 4 + 0 15 + -4z = 4 Add '-15' to each side of the equation. 15 + -15 + -4z = 4 + -15 Combine like terms: 15 + -15 = 0 0 + -4z = 4 + -15 -4z = 4 + -15 Combine like terms: 4 + -15 = -11 -4z = -11 Divide each side by '-4'. z = 2.75 Simplifying z = 2.75
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