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Simplifying 21 + 9y = 16y Solving 21 + 9y = 16y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-16y' to each side of the equation. 21 + 9y + -16y = 16y + -16y Combine like terms: 9y + -16y = -7y 21 + -7y = 16y + -16y Combine like terms: 16y + -16y = 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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