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Simplifying 7(7c + -7) = 21 Reorder the terms: 7(-7 + 7c) = 21 (-7 * 7 + 7c * 7) = 21 (-49 + 49c) = 21 Solving -49 + 49c = 21 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '49' to each side of the equation. -49 + 49 + 49c = 21 + 49 Combine like terms: -49 + 49 = 0 0 + 49c = 21 + 49 49c = 21 + 49 Combine like terms: 21 + 49 = 70 49c = 70 Divide each side by '49'. c = 1.428571429 Simplifying c = 1.428571429
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