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Simplifying 21 + -1y = 87 + 2y Solving 21 + -1y = 87 + 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 + -1y + -2y = 87 + 2y + -2y Combine like terms: -1y + -2y = -3y 21 + -3y = 87 + 2y + -2y Combine like terms: 2y + -2y = 0 21 + -3y = 87 + 0 21 + -3y = 87 Add '-21' to each side of the equation. 21 + -21 + -3y = 87 + -21 Combine like terms: 21 + -21 = 0 0 + -3y = 87 + -21 -3y = 87 + -21 Combine like terms: 87 + -21 = 66 -3y = 66 Divide each side by '-3'. y = -22 Simplifying y = -22
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