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Simplifying 20 + -4f = -28 + 2f Solving 20 + -4f = -28 + 2f Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-2f' to each side of the equation. 20 + -4f + -2f = -28 + 2f + -2f Combine like terms: -4f + -2f = -6f 20 + -6f = -28 + 2f + -2f Combine like terms: 2f + -2f = 0 20 + -6f = -28 + 0 20 + -6f = -28 Add '-20' to each side of the equation. 20 + -20 + -6f = -28 + -20 Combine like terms: 20 + -20 = 0 0 + -6f = -28 + -20 -6f = -28 + -20 Combine like terms: -28 + -20 = -48 -6f = -48 Divide each side by '-6'. f = 8 Simplifying f = 8
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