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Simplifying 0.3(4z + 7) + 25.7 = 0.7(4z + -6) Reorder the terms: 0.3(7 + 4z) + 25.7 = 0.7(4z + -6) (7 * 0.3 + 4z * 0.3) + 25.7 = 0.7(4z + -6) (2.1 + 1.2z) + 25.7 = 0.7(4z + -6) Reorder the terms: 2.1 + 25.7 + 1.2z = 0.7(4z + -6) Combine like terms: 2.1 + 25.7 = 27.8 27.8 + 1.2z = 0.7(4z + -6) Reorder the terms: 27.8 + 1.2z = 0.7(-6 + 4z) 27.8 + 1.2z = (-6 * 0.7 + 4z * 0.7) 27.8 + 1.2z = (-4.2 + 2.8z) Solving 27.8 + 1.2z = -4.2 + 2.8z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-2.8z' to each side of the equation. 27.8 + 1.2z + -2.8z = -4.2 + 2.8z + -2.8z Combine like terms: 1.2z + -2.8z = -1.6z 27.8 + -1.6z = -4.2 + 2.8z + -2.8z Combine like terms: 2.8z + -2.8z = 0.0 27.8 + -1.6z = -4.2 + 0.0 27.8 + -1.6z = -4.2 Add '-27.8' to each side of the equation. 27.8 + -27.8 + -1.6z = -4.2 + -27.8 Combine like terms: 27.8 + -27.8 = 0.0 0.0 + -1.6z = -4.2 + -27.8 -1.6z = -4.2 + -27.8 Combine like terms: -4.2 + -27.8 = -32 -1.6z = -32 Divide each side by '-1.6'. z = 20 Simplifying z = 20
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