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Simplifying -7z + 4 + -7 = -12 Reorder the terms: 4 + -7 + -7z = -12 Combine like terms: 4 + -7 = -3 -3 + -7z = -12 Solving -3 + -7z = -12 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -7z = -12 + 3 Combine like terms: -3 + 3 = 0 0 + -7z = -12 + 3 -7z = -12 + 3 Combine like terms: -12 + 3 = -9 -7z = -9 Divide each side by '-7'. z = 1.285714286 Simplifying z = 1.285714286
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