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Simplifying 12y + -1(21 + -1y) = 2y 12y + (21 * -1 + -1y * -1) = 2y 12y + (-21 + 1y) = 2y Reorder the terms: -21 + 12y + 1y = 2y Combine like terms: 12y + 1y = 13y -21 + 13y = 2y Solving -21 + 13y = 2y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2y' to each side of the equation. -21 + 13y + -2y = 2y + -2y Combine like terms: 13y + -2y = 11y -21 + 11y = 2y + -2y Combine like terms: 2y + -2y = 0 -21 + 11y = 0 Add '21' to each side of the equation. -21 + 21 + 11y = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 11y = 0 + 21 11y = 0 + 21 Combine like terms: 0 + 21 = 21 11y = 21 Divide each side by '11'. y = 1.909090909 Simplifying y = 1.909090909
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