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Simplifying 21 + -2y = y Solving 21 + -2y = y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1y' to each side of the equation. 21 + -2y + -1y = y + -1y Combine like terms: -2y + -1y = -3y 21 + -3y = y + -1y Combine like terms: y + -1y = 0 21 + -3y = 0 Add '-21' to each side of the equation. 21 + -21 + -3y = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3y = 0 + -21 -3y = 0 + -21 Combine like terms: 0 + -21 = -21 -3y = -21 Divide each side by '-3'. y = 7 Simplifying y = 7
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