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Simplifying -3f + 3(-3f + 5) = -81 Reorder the terms: -3f + 3(5 + -3f) = -81 -3f + (5 * 3 + -3f * 3) = -81 -3f + (15 + -9f) = -81 Reorder the terms: 15 + -3f + -9f = -81 Combine like terms: -3f + -9f = -12f 15 + -12f = -81 Solving 15 + -12f = -81 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -12f = -81 + -15 Combine like terms: 15 + -15 = 0 0 + -12f = -81 + -15 -12f = -81 + -15 Combine like terms: -81 + -15 = -96 -12f = -96 Divide each side by '-12'. f = 8 Simplifying f = 8
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