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Simplifying 4y + 21 = 7y Reorder the terms: 21 + 4y = 7y Solving 21 + 4y = 7y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-7y' to each side of the equation. 21 + 4y + -7y = 7y + -7y Combine like terms: 4y + -7y = -3y 21 + -3y = 7y + -7y Combine like terms: 7y + -7y = 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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