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