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Simplifying 9y + 12y + 4 = 0 Reorder the terms: 4 + 9y + 12y = 0 Combine like terms: 9y + 12y = 21y 4 + 21y = 0 Solving 4 + 21y = 0 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 21y = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 21y = 0 + -4 21y = 0 + -4 Combine like terms: 0 + -4 = -4 21y = -4 Divide each side by '21'. y = -0.1904761905 Simplifying y = -0.1904761905
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