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Simplifying -4 + y + 21 = 3y + 21 Reorder the terms: -4 + 21 + y = 3y + 21 Combine like terms: -4 + 21 = 17 17 + y = 3y + 21 Reorder the terms: 17 + y = 21 + 3y Solving 17 + y = 21 + 3y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3y' to each side of the equation. 17 + y + -3y = 21 + 3y + -3y Combine like terms: y + -3y = -2y 17 + -2y = 21 + 3y + -3y Combine like terms: 3y + -3y = 0 17 + -2y = 21 + 0 17 + -2y = 21 Add '-17' to each side of the equation. 17 + -17 + -2y = 21 + -17 Combine like terms: 17 + -17 = 0 0 + -2y = 21 + -17 -2y = 21 + -17 Combine like terms: 21 + -17 = 4 -2y = 4 Divide each side by '-2'. y = -2 Simplifying y = -2
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