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Simplifying 7y + -4 = 2y + 21 Reorder the terms: -4 + 7y = 2y + 21 Reorder the terms: -4 + 7y = 21 + 2y Solving -4 + 7y = 21 + 2y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2y' to each side of the equation. -4 + 7y + -2y = 21 + 2y + -2y Combine like terms: 7y + -2y = 5y -4 + 5y = 21 + 2y + -2y Combine like terms: 2y + -2y = 0 -4 + 5y = 21 + 0 -4 + 5y = 21 Add '4' to each side of the equation. -4 + 4 + 5y = 21 + 4 Combine like terms: -4 + 4 = 0 0 + 5y = 21 + 4 5y = 21 + 4 Combine like terms: 21 + 4 = 25 5y = 25 Divide each side by '5'. y = 5 Simplifying y = 5
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