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Simplifying 12f + -18 = 13 + 18 Reorder the terms: -18 + 12f = 13 + 18 Combine like terms: 13 + 18 = 31 -18 + 12f = 31 Solving -18 + 12f = 31 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 12f = 31 + 18 Combine like terms: -18 + 18 = 0 0 + 12f = 31 + 18 12f = 31 + 18 Combine like terms: 31 + 18 = 49 12f = 49 Divide each side by '12'. f = 4.083333333 Simplifying f = 4.083333333
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