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Simplifying f(a + b) = 9x2 + -4x (a * f + b * f) = 9x2 + -4x (af + bf) = 9x2 + -4x Reorder the terms: af + bf = -4x + 9x2 Solving af + bf = -4x + 9x2 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1bf' to each side of the equation. af + bf + -1bf = -4x + -1bf + 9x2 Combine like terms: bf + -1bf = 0 af + 0 = -4x + -1bf + 9x2 af = -4x + -1bf + 9x2 Reorder the terms: af = -1bf + -4x + 9x2 Divide each side by 'f'. a = -1b + -4f-1x + 9f-1x2 Simplifying a = -1b + -4f-1x + 9f-1x2
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