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Simplifying 2y + -1[7 + -5y] + -21 = 0 2y + [7 * -1 + -5y * -1] + -21 = 0 2y + [-7 + 5y] + -21 = 0 Reorder the terms: -7 + -21 + 2y + 5y = 0 Combine like terms: -7 + -21 = -28 -28 + 2y + 5y = 0 Combine like terms: 2y + 5y = 7y -28 + 7y = 0 Solving -28 + 7y = 0 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 7y = 0 + 28 Combine like terms: -28 + 28 = 0 0 + 7y = 0 + 28 7y = 0 + 28 Combine like terms: 0 + 28 = 28 7y = 28 Divide each side by '7'. y = 4 Simplifying y = 4
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