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Simplifying 21 + 3f = 9 + -3f Solving 21 + 3f = 9 + -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 = 9 + -3f + 3f Combine like terms: 3f + 3f = 6f 21 + 6f = 9 + -3f + 3f Combine like terms: -3f + 3f = 0 21 + 6f = 9 + 0 21 + 6f = 9 Add '-21' to each side of the equation. 21 + -21 + 6f = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 6f = 9 + -21 6f = 9 + -21 Combine like terms: 9 + -21 = -12 6f = -12 Divide each side by '6'. f = -2 Simplifying f = -2
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