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