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Simplifying 13 = f + 15 Reorder the terms: 13 = 15 + f Solving 13 = 15 + f Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-1f' to each side of the equation. 13 + -1f = 15 + f + -1f Combine like terms: f + -1f = 0 13 + -1f = 15 + 0 13 + -1f = 15 Add '-13' to each side of the equation. 13 + -13 + -1f = 15 + -13 Combine like terms: 13 + -13 = 0 0 + -1f = 15 + -13 -1f = 15 + -13 Combine like terms: 15 + -13 = 2 -1f = 2 Divide each side by '-1'. f = -2 Simplifying f = -2
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