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Simplifying 3y + 84 = 9y + 12 Reorder the terms: 84 + 3y = 9y + 12 Reorder the terms: 84 + 3y = 12 + 9y Solving 84 + 3y = 12 + 9y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-9y' to each side of the equation. 84 + 3y + -9y = 12 + 9y + -9y Combine like terms: 3y + -9y = -6y 84 + -6y = 12 + 9y + -9y Combine like terms: 9y + -9y = 0 84 + -6y = 12 + 0 84 + -6y = 12 Add '-84' to each side of the equation. 84 + -84 + -6y = 12 + -84 Combine like terms: 84 + -84 = 0 0 + -6y = 12 + -84 -6y = 12 + -84 Combine like terms: 12 + -84 = -72 -6y = -72 Divide each side by '-6'. y = 12 Simplifying y = 12
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