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Simplifying f(-1x) = 9(-1x) + 9 Remove parenthesis around (-1x) f * -1x = 9(-1x) + 9 Reorder the terms for easier multiplication: -1f * x = 9(-1x) + 9 Multiply f * x -1fx = 9(-1x) + 9 Remove parenthesis around (-1x) -1fx = 9 * -1x + 9 Multiply 9 * -1 -1fx = -9x + 9 Reorder the terms: -1fx = 9 + -9x Solving -1fx = 9 + -9x Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by '-1x'. f = -9x-1 + 9 Simplifying f = -9x-1 + 9 Reorder the terms: f = 9 + -9x-1
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