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Simplifying 3y + -21 + 4y = 15 + -2y Reorder the terms: -21 + 3y + 4y = 15 + -2y Combine like terms: 3y + 4y = 7y -21 + 7y = 15 + -2y Solving -21 + 7y = 15 + -2y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2y' to each side of the equation. -21 + 7y + 2y = 15 + -2y + 2y Combine like terms: 7y + 2y = 9y -21 + 9y = 15 + -2y + 2y Combine like terms: -2y + 2y = 0 -21 + 9y = 15 + 0 -21 + 9y = 15 Add '21' to each side of the equation. -21 + 21 + 9y = 15 + 21 Combine like terms: -21 + 21 = 0 0 + 9y = 15 + 21 9y = 15 + 21 Combine like terms: 15 + 21 = 36 9y = 36 Divide each side by '9'. y = 4 Simplifying y = 4
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