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Simplifying -3(f + -5) = -21 Reorder the terms: -3(-5 + f) = -21 (-5 * -3 + f * -3) = -21 (15 + -3f) = -21 Solving 15 + -3f = -21 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -3f = -21 + -15 Combine like terms: 15 + -15 = 0 0 + -3f = -21 + -15 -3f = -21 + -15 Combine like terms: -21 + -15 = -36 -3f = -36 Divide each side by '-3'. f = 12 Simplifying f = 12
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