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Simplifying 4 = -9(f + -9) Reorder the terms: 4 = -9(-9 + f) 4 = (-9 * -9 + f * -9) 4 = (81 + -9f) Solving 4 = 81 + -9f Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '9f' to each side of the equation. 4 + 9f = 81 + -9f + 9f Combine like terms: -9f + 9f = 0 4 + 9f = 81 + 0 4 + 9f = 81 Add '-4' to each side of the equation. 4 + -4 + 9f = 81 + -4 Combine like terms: 4 + -4 = 0 0 + 9f = 81 + -4 9f = 81 + -4 Combine like terms: 81 + -4 = 77 9f = 77 Divide each side by '9'. f = 8.555555556 Simplifying f = 8.555555556
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