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Simplifying 15 + -1f = f + 7 Reorder the terms: 15 + -1f = 7 + f Solving 15 + -1f = 7 + 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. 15 + -1f + -1f = 7 + f + -1f Combine like terms: -1f + -1f = -2f 15 + -2f = 7 + f + -1f Combine like terms: f + -1f = 0 15 + -2f = 7 + 0 15 + -2f = 7 Add '-15' to each side of the equation. 15 + -15 + -2f = 7 + -15 Combine like terms: 15 + -15 = 0 0 + -2f = 7 + -15 -2f = 7 + -15 Combine like terms: 7 + -15 = -8 -2f = -8 Divide each side by '-2'. f = 4 Simplifying f = 4
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