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Simplifying 21 = 14f + -21 Reorder the terms: 21 = -21 + 14f Solving 21 = -21 + 14f Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-14f' to each side of the equation. 21 + -14f = -21 + 14f + -14f Combine like terms: 14f + -14f = 0 21 + -14f = -21 + 0 21 + -14f = -21 Add '-21' to each side of the equation. 21 + -21 + -14f = -21 + -21 Combine like terms: 21 + -21 = 0 0 + -14f = -21 + -21 -14f = -21 + -21 Combine like terms: -21 + -21 = -42 -14f = -42 Divide each side by '-14'. f = 3 Simplifying f = 3
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