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Simplifying z + 3(z + -7) = 19 Reorder the terms: z + 3(-7 + z) = 19 z + (-7 * 3 + z * 3) = 19 z + (-21 + 3z) = 19 Reorder the terms: -21 + z + 3z = 19 Combine like terms: z + 3z = 4z -21 + 4z = 19 Solving -21 + 4z = 19 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 4z = 19 + 21 Combine like terms: -21 + 21 = 0 0 + 4z = 19 + 21 4z = 19 + 21 Combine like terms: 19 + 21 = 40 4z = 40 Divide each side by '4'. z = 10 Simplifying z = 10
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