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Simplifying -81 = 7f + 19 + 3f Reorder the terms: -81 = 19 + 7f + 3f Combine like terms: 7f + 3f = 10f -81 = 19 + 10f Solving -81 = 19 + 10f Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-10f' to each side of the equation. -81 + -10f = 19 + 10f + -10f Combine like terms: 10f + -10f = 0 -81 + -10f = 19 + 0 -81 + -10f = 19 Add '81' to each side of the equation. -81 + 81 + -10f = 19 + 81 Combine like terms: -81 + 81 = 0 0 + -10f = 19 + 81 -10f = 19 + 81 Combine like terms: 19 + 81 = 100 -10f = 100 Divide each side by '-10'. f = -10 Simplifying f = -10
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