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Simplifying 12 = -7f + -9 Reorder the terms: 12 = -9 + -7f Solving 12 = -9 + -7f Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '7f' to each side of the equation. 12 + 7f = -9 + -7f + 7f Combine like terms: -7f + 7f = 0 12 + 7f = -9 + 0 12 + 7f = -9 Add '-12' to each side of the equation. 12 + -12 + 7f = -9 + -12 Combine like terms: 12 + -12 = 0 0 + 7f = -9 + -12 7f = -9 + -12 Combine like terms: -9 + -12 = -21 7f = -21 Divide each side by '7'. f = -3 Simplifying f = -3
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