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Simplifying 21 = 3(0.75c + -8) Reorder the terms: 21 = 3(-8 + 0.75c) 21 = (-8 * 3 + 0.75c * 3) 21 = (-24 + 2.25c) Solving 21 = -24 + 2.25c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-2.25c' to each side of the equation. 21 + -2.25c = -24 + 2.25c + -2.25c Combine like terms: 2.25c + -2.25c = 0.00 21 + -2.25c = -24 + 0.00 21 + -2.25c = -24 Add '-21' to each side of the equation. 21 + -21 + -2.25c = -24 + -21 Combine like terms: 21 + -21 = 0 0 + -2.25c = -24 + -21 -2.25c = -24 + -21 Combine like terms: -24 + -21 = -45 -2.25c = -45 Divide each side by '-2.25'. c = 20 Simplifying c = 20
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