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Simplifying -9(f + -7) = 18 Reorder the terms: -9(-7 + f) = 18 (-7 * -9 + f * -9) = 18 (63 + -9f) = 18 Solving 63 + -9f = 18 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + -9f = 18 + -63 Combine like terms: 63 + -63 = 0 0 + -9f = 18 + -63 -9f = 18 + -63 Combine like terms: 18 + -63 = -45 -9f = -45 Divide each side by '-9'. f = 5 Simplifying f = 5
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