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Simplifying f(90) = 2(90) + 20 Reorder the terms for easier multiplication: 90f = 2(90) + 20 Multiply 2 * 90 90f = 180 + 20 Combine like terms: 180 + 20 = 200 90f = 200 Solving 90f = 200 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by '90'. f = 2.222222222 Simplifying f = 2.222222222
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