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Simplifying f(x + 3) = f(x) + -3 Reorder the terms: f(3 + x) = f(x) + -3 (3 * f + x * f) = f(x) + -3 (3f + fx) = f(x) + -3 Multiply f * x 3f + fx = fx + -3 Reorder the terms: 3f + fx = -3 + fx Add '-1fx' to each side of the equation. 3f + fx + -1fx = -3 + fx + -1fx Combine like terms: fx + -1fx = 0 3f + 0 = -3 + fx + -1fx 3f = -3 + fx + -1fx Combine like terms: fx + -1fx = 0 3f = -3 + 0 3f = -3 Solving 3f = -3 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by '3'. f = -1 Simplifying f = -1
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