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Simplifying 21 = y + 3y Combine like terms: y + 3y = 4y 21 = 4y Solving 21 = 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 = 4y + -4y Combine like terms: 4y + -4y = 0 21 + -4y = 0 Add '-21' to each side of the equation. 21 + -21 + -4y = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -4y = 0 + -21 -4y = 0 + -21 Combine like terms: 0 + -21 = -21 -4y = -21 Divide each side by '-4'. y = 5.25 Simplifying y = 5.25
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