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Simplifying 42c + 1 + -38c = 21 Reorder the terms: 1 + 42c + -38c = 21 Combine like terms: 42c + -38c = 4c 1 + 4c = 21 Solving 1 + 4c = 21 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 4c = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 4c = 21 + -1 4c = 21 + -1 Combine like terms: 21 + -1 = 20 4c = 20 Divide each side by '4'. c = 5 Simplifying c = 5
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