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Simplifying 12 + 6y = 21 + -3y Solving 12 + 6y = 21 + -3y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3y' to each side of the equation. 12 + 6y + 3y = 21 + -3y + 3y Combine like terms: 6y + 3y = 9y 12 + 9y = 21 + -3y + 3y Combine like terms: -3y + 3y = 0 12 + 9y = 21 + 0 12 + 9y = 21 Add '-12' to each side of the equation. 12 + -12 + 9y = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 9y = 21 + -12 9y = 21 + -12 Combine like terms: 21 + -12 = 9 9y = 9 Divide each side by '9'. y = 1 Simplifying y = 1
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