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Simplifying -7y(y + -3) + y2 = -6y2 + -63 Reorder the terms: -7y(-3 + y) + y2 = -6y2 + -63 (-3 * -7y + y * -7y) + y2 = -6y2 + -63 (21y + -7y2) + y2 = -6y2 + -63 Combine like terms: -7y2 + y2 = -6y2 21y + -6y2 = -6y2 + -63 Reorder the terms: 21y + -6y2 = -63 + -6y2 Add '6y2' to each side of the equation. 21y + -6y2 + 6y2 = -63 + -6y2 + 6y2 Combine like terms: -6y2 + 6y2 = 0 21y + 0 = -63 + -6y2 + 6y2 21y = -63 + -6y2 + 6y2 Combine like terms: -6y2 + 6y2 = 0 21y = -63 + 0 21y = -63 Solving 21y = -63 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Divide each side by '21'. y = -3 Simplifying y = -3
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