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Simplifying 2(-2a2 + -4d) + -1(-3a2 + 17d) = 0 (-2a2 * 2 + -4d * 2) + -1(-3a2 + 17d) = 0 (-4a2 + -8d) + -1(-3a2 + 17d) = 0 -4a2 + -8d + (-3a2 * -1 + 17d * -1) = 0 -4a2 + -8d + (3a2 + -17d) = 0 Reorder the terms: -4a2 + 3a2 + -8d + -17d = 0 Combine like terms: -4a2 + 3a2 = -1a2 -1a2 + -8d + -17d = 0 Combine like terms: -8d + -17d = -25d -1a2 + -25d = 0 Solving -1a2 + -25d = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '25d' to each side of the equation. -1a2 + -25d + 25d = 0 + 25d Combine like terms: -25d + 25d = 0 -1a2 + 0 = 0 + 25d -1a2 = 0 + 25d Remove the zero: -1a2 = 25d Divide each side by '-1'. a2 = -25d Simplifying a2 = -25d Combine like terms: -25d + 25d = 0 a2 + 25d = 0 The solution to this equation could not be determined.
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