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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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