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Simplifying 21y + 15y + 30 = 180 Reorder the terms: 30 + 21y + 15y = 180 Combine like terms: 21y + 15y = 36y 30 + 36y = 180 Solving 30 + 36y = 180 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 36y = 180 + -30 Combine like terms: 30 + -30 = 0 0 + 36y = 180 + -30 36y = 180 + -30 Combine like terms: 180 + -30 = 150 36y = 150 Divide each side by '36'. y = 4.166666667 Simplifying y = 4.166666667
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