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Simplifying f(x) = 20(0.9) Multiply f * x fx = 20(0.9) Multiply 20 * 0.9 fx = 18 Solving fx = 18 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by 'x'. f = 18x-1 Simplifying f = 18x-1
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