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Simplifying 21 = 5y + 2y Combine like terms: 5y + 2y = 7y 21 = 7y Solving 21 = 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 + -7y = 7y + -7y Combine like terms: 7y + -7y = 0 21 + -7y = 0 Add '-21' to each side of the equation. 21 + -21 + -7y = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -7y = 0 + -21 -7y = 0 + -21 Combine like terms: 0 + -21 = -21 -7y = -21 Divide each side by '-7'. y = 3 Simplifying y = 3
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