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Simplifying 20 = -4(f + 6) + 15 Reorder the terms: 20 = -4(6 + f) + 15 20 = (6 * -4 + f * -4) + 15 20 = (-24 + -4f) + 15 Reorder the terms: 20 = -24 + 15 + -4f Combine like terms: -24 + 15 = -9 20 = -9 + -4f Solving 20 = -9 + -4f Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '4f' to each side of the equation. 20 + 4f = -9 + -4f + 4f Combine like terms: -4f + 4f = 0 20 + 4f = -9 + 0 20 + 4f = -9 Add '-20' to each side of the equation. 20 + -20 + 4f = -9 + -20 Combine like terms: 20 + -20 = 0 0 + 4f = -9 + -20 4f = -9 + -20 Combine like terms: -9 + -20 = -29 4f = -29 Divide each side by '4'. f = -7.25 Simplifying f = -7.25
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