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Simplifying -1.9 + -3z + -6.6 + -1z = -3z + -6.9 Reorder the terms: -1.9 + -6.6 + -3z + -1z = -3z + -6.9 Combine like terms: -1.9 + -6.6 = -8.5 -8.5 + -3z + -1z = -3z + -6.9 Combine like terms: -3z + -1z = -4z -8.5 + -4z = -3z + -6.9 Reorder the terms: -8.5 + -4z = -6.9 + -3z Solving -8.5 + -4z = -6.9 + -3z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '3z' to each side of the equation. -8.5 + -4z + 3z = -6.9 + -3z + 3z Combine like terms: -4z + 3z = -1z -8.5 + -1z = -6.9 + -3z + 3z Combine like terms: -3z + 3z = 0 -8.5 + -1z = -6.9 + 0 -8.5 + -1z = -6.9 Add '8.5' to each side of the equation. -8.5 + 8.5 + -1z = -6.9 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + -1z = -6.9 + 8.5 -1z = -6.9 + 8.5 Combine like terms: -6.9 + 8.5 = 1.6 -1z = 1.6 Divide each side by '-1'. z = -1.6 Simplifying z = -1.6
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