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Simplifying 15y + 18 + -2y = -21 Reorder the terms: 18 + 15y + -2y = -21 Combine like terms: 15y + -2y = 13y 18 + 13y = -21 Solving 18 + 13y = -21 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 13y = -21 + -18 Combine like terms: 18 + -18 = 0 0 + 13y = -21 + -18 13y = -21 + -18 Combine like terms: -21 + -18 = -39 13y = -39 Divide each side by '13'. y = -3 Simplifying y = -3
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