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Simplifying 0.4(4z + 7) + 2.8 = 0.6(4z + -4) Reorder the terms: 0.4(7 + 4z) + 2.8 = 0.6(4z + -4) (7 * 0.4 + 4z * 0.4) + 2.8 = 0.6(4z + -4) (2.8 + 1.6z) + 2.8 = 0.6(4z + -4) Reorder the terms: 2.8 + 2.8 + 1.6z = 0.6(4z + -4) Combine like terms: 2.8 + 2.8 = 5.6 5.6 + 1.6z = 0.6(4z + -4) Reorder the terms: 5.6 + 1.6z = 0.6(-4 + 4z) 5.6 + 1.6z = (-4 * 0.6 + 4z * 0.6) 5.6 + 1.6z = (-2.4 + 2.4z) Solving 5.6 + 1.6z = -2.4 + 2.4z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-2.4z' to each side of the equation. 5.6 + 1.6z + -2.4z = -2.4 + 2.4z + -2.4z Combine like terms: 1.6z + -2.4z = -0.8z 5.6 + -0.8z = -2.4 + 2.4z + -2.4z Combine like terms: 2.4z + -2.4z = 0.0 5.6 + -0.8z = -2.4 + 0.0 5.6 + -0.8z = -2.4 Add '-5.6' to each side of the equation. 5.6 + -5.6 + -0.8z = -2.4 + -5.6 Combine like terms: 5.6 + -5.6 = 0.0 0.0 + -0.8z = -2.4 + -5.6 -0.8z = -2.4 + -5.6 Combine like terms: -2.4 + -5.6 = -8 -0.8z = -8 Divide each side by '-0.8'. z = 10 Simplifying z = 10
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