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Simplifying 12 = -4(f + -20) Reorder the terms: 12 = -4(-20 + f) 12 = (-20 * -4 + f * -4) 12 = (80 + -4f) Solving 12 = 80 + -4f Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '4f' to each side of the equation. 12 + 4f = 80 + -4f + 4f Combine like terms: -4f + 4f = 0 12 + 4f = 80 + 0 12 + 4f = 80 Add '-12' to each side of the equation. 12 + -12 + 4f = 80 + -12 Combine like terms: 12 + -12 = 0 0 + 4f = 80 + -12 4f = 80 + -12 Combine like terms: 80 + -12 = 68 4f = 68 Divide each side by '4'. f = 17 Simplifying f = 17
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