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Simplifying 81 + -1f = 42 Solving 81 + -1f = 42 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-81' to each side of the equation. 81 + -81 + -1f = 42 + -81 Combine like terms: 81 + -81 = 0 0 + -1f = 42 + -81 -1f = 42 + -81 Combine like terms: 42 + -81 = -39 -1f = -39 Divide each side by '-1'. f = 39 Simplifying f = 39
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