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Simplifying 8c + 7(s + z) = 19.40 8c + (s * 7 + z * 7) = 19.40 8c + (7s + 7z) = 19.40 Solving 8c + 7s + 7z = 19.40 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-7s' to each side of the equation. 8c + 7s + -7s + 7z = 19.40 + -7s Combine like terms: 7s + -7s = 0 8c + 0 + 7z = 19.40 + -7s 8c + 7z = 19.40 + -7s Add '-7z' to each side of the equation. 8c + 7z + -7z = 19.40 + -7s + -7z Combine like terms: 7z + -7z = 0 8c + 0 = 19.40 + -7s + -7z 8c = 19.40 + -7s + -7z Divide each side by '8'. c = 2.425 + -0.875s + -0.875z Simplifying c = 2.425 + -0.875s + -0.875z
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