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Simplifying (8y2 + -7y + -4) + (-9y2 + 5y + -4) + -1(-1y2 + 4y + -8) = 0 Reorder the terms: (-4 + -7y + 8y2) + (-9y2 + 5y + -4) + -1(-1y2 + 4y + -8) = 0 Remove parenthesis around (-4 + -7y + 8y2) -4 + -7y + 8y2 + (-9y2 + 5y + -4) + -1(-1y2 + 4y + -8) = 0 Reorder the terms: -4 + -7y + 8y2 + (-4 + 5y + -9y2) + -1(-1y2 + 4y + -8) = 0 Remove parenthesis around (-4 + 5y + -9y2) -4 + -7y + 8y2 + -4 + 5y + -9y2 + -1(-1y2 + 4y + -8) = 0 Reorder the terms: -4 + -7y + 8y2 + -4 + 5y + -9y2 + -1(-8 + 4y + -1y2) = 0 -4 + -7y + 8y2 + -4 + 5y + -9y2 + (-8 * -1 + 4y * -1 + -1y2 * -1) = 0 -4 + -7y + 8y2 + -4 + 5y + -9y2 + (8 + -4y + 1y2) = 0 Reorder the terms: -4 + -4 + 8 + -7y + 5y + -4y + 8y2 + -9y2 + 1y2 = 0 Combine like terms: -4 + -4 = -8 -8 + 8 + -7y + 5y + -4y + 8y2 + -9y2 + 1y2 = 0 Combine like terms: -8 + 8 = 0 0 + -7y + 5y + -4y + 8y2 + -9y2 + 1y2 = 0 -7y + 5y + -4y + 8y2 + -9y2 + 1y2 = 0 Combine like terms: -7y + 5y = -2y -2y + -4y + 8y2 + -9y2 + 1y2 = 0 Combine like terms: -2y + -4y = -6y -6y + 8y2 + -9y2 + 1y2 = 0 Combine like terms: 8y2 + -9y2 = -1y2 -6y + -1y2 + 1y2 = 0 Combine like terms: -1y2 + 1y2 = 0 -6y + 0 = 0 -6y = 0 Solving -6y = 0 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Divide each side by '-6'. y = 0 Simplifying y = 0
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