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Simplifying 4f + -9 = f + 12 Reorder the terms: -9 + 4f = f + 12 Reorder the terms: -9 + 4f = 12 + f Solving -9 + 4f = 12 + f Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-1f' to each side of the equation. -9 + 4f + -1f = 12 + f + -1f Combine like terms: 4f + -1f = 3f -9 + 3f = 12 + f + -1f Combine like terms: f + -1f = 0 -9 + 3f = 12 + 0 -9 + 3f = 12 Add '9' to each side of the equation. -9 + 9 + 3f = 12 + 9 Combine like terms: -9 + 9 = 0 0 + 3f = 12 + 9 3f = 12 + 9 Combine like terms: 12 + 9 = 21 3f = 21 Divide each side by '3'. f = 7 Simplifying f = 7
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