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Simplifying 15y + 30 = 21y Reorder the terms: 30 + 15y = 21y Solving 30 + 15y = 21y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-21y' to each side of the equation. 30 + 15y + -21y = 21y + -21y Combine like terms: 15y + -21y = -6y 30 + -6y = 21y + -21y Combine like terms: 21y + -21y = 0 30 + -6y = 0 Add '-30' to each side of the equation. 30 + -30 + -6y = 0 + -30 Combine like terms: 30 + -30 = 0 0 + -6y = 0 + -30 -6y = 0 + -30 Combine like terms: 0 + -30 = -30 -6y = -30 Divide each side by '-6'. y = 5 Simplifying y = 5
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