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Simplifying -1(2y + -1) + -9y = -21 Reorder the terms: -1(-1 + 2y) + -9y = -21 (-1 * -1 + 2y * -1) + -9y = -21 (1 + -2y) + -9y = -21 Combine like terms: -2y + -9y = -11y 1 + -11y = -21 Solving 1 + -11y = -21 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -11y = -21 + -1 Combine like terms: 1 + -1 = 0 0 + -11y = -21 + -1 -11y = -21 + -1 Combine like terms: -21 + -1 = -22 -11y = -22 Divide each side by '-11'. y = 2 Simplifying y = 2
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