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Simplifying 10 + -1(10 + -1y) = 21 + -2y 10 + (10 * -1 + -1y * -1) = 21 + -2y 10 + (-10 + 1y) = 21 + -2y Combine like terms: 10 + -10 = 0 0 + 1y = 21 + -2y 1y = 21 + -2y Solving 1y = 21 + -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. 1y + 2y = 21 + -2y + 2y Combine like terms: 1y + 2y = 3y 3y = 21 + -2y + 2y Combine like terms: -2y + 2y = 0 3y = 21 + 0 3y = 21 Divide each side by '3'. y = 7 Simplifying y = 7
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