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Simplifying 3f + 9 = 2f + -12 Reorder the terms: 9 + 3f = 2f + -12 Reorder the terms: 9 + 3f = -12 + 2f Solving 9 + 3f = -12 + 2f Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-2f' to each side of the equation. 9 + 3f + -2f = -12 + 2f + -2f Combine like terms: 3f + -2f = 1f 9 + 1f = -12 + 2f + -2f Combine like terms: 2f + -2f = 0 9 + 1f = -12 + 0 9 + 1f = -12 Add '-9' to each side of the equation. 9 + -9 + 1f = -12 + -9 Combine like terms: 9 + -9 = 0 0 + 1f = -12 + -9 1f = -12 + -9 Combine like terms: -12 + -9 = -21 1f = -21 Divide each side by '1'. f = -21 Simplifying f = -21
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