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Simplifying 21 = 3(y + -1) + y Reorder the terms: 21 = 3(-1 + y) + y 21 = (-1 * 3 + y * 3) + y 21 = (-3 + 3y) + y Combine like terms: 3y + y = 4y 21 = -3 + 4y Solving 21 = -3 + 4y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4y' to each side of the equation. 21 + -4y = -3 + 4y + -4y Combine like terms: 4y + -4y = 0 21 + -4y = -3 + 0 21 + -4y = -3 Add '-21' to each side of the equation. 21 + -21 + -4y = -3 + -21 Combine like terms: 21 + -21 = 0 0 + -4y = -3 + -21 -4y = -3 + -21 Combine like terms: -3 + -21 = -24 -4y = -24 Divide each side by '-4'. y = 6 Simplifying y = 6
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