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Simplifying f(-3) = 5x + 21 Reorder the terms for easier multiplication: -3f = 5x + 21 Reorder the terms: -3f = 21 + 5x Solving -3f = 21 + 5x Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by '-3'. f = -7 + -1.666666667x Simplifying f = -7 + -1.666666667x
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