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Simplifying 21 = 3f Solving 21 = 3f Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-3f' to each side of the equation. 21 + -3f = 3f + -3f Combine like terms: 3f + -3f = 0 21 + -3f = 0 Add '-21' to each side of the equation. 21 + -21 + -3f = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3f = 0 + -21 -3f = 0 + -21 Combine like terms: 0 + -21 = -21 -3f = -21 Divide each side by '-3'. f = 7 Simplifying f = 7
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