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Simplifying 6.4 + -2.1(z + -2) = 8.5 Reorder the terms: 6.4 + -2.1(-2 + z) = 8.5 6.4 + (-2 * -2.1 + z * -2.1) = 8.5 6.4 + (4.2 + -2.1z) = 8.5 Combine like terms: 6.4 + 4.2 = 10.6 10.6 + -2.1z = 8.5 Solving 10.6 + -2.1z = 8.5 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-10.6' to each side of the equation. 10.6 + -10.6 + -2.1z = 8.5 + -10.6 Combine like terms: 10.6 + -10.6 = 0.0 0.0 + -2.1z = 8.5 + -10.6 -2.1z = 8.5 + -10.6 Combine like terms: 8.5 + -10.6 = -2.1 -2.1z = -2.1 Divide each side by '-2.1'. z = 1 Simplifying z = 1
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