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Simplifying 2y + -1(7 + -5) + -21 = 0 Combine like terms: 7 + -5 = 2 2y + -1(2) + -21 = 0 Multiply -1 * 2 2y + -2 + -21 = 0 Reorder the terms: -2 + -21 + 2y = 0 Combine like terms: -2 + -21 = -23 -23 + 2y = 0 Solving -23 + 2y = 0 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '23' to each side of the equation. -23 + 23 + 2y = 0 + 23 Combine like terms: -23 + 23 = 0 0 + 2y = 0 + 23 2y = 0 + 23 Combine like terms: 0 + 23 = 23 2y = 23 Divide each side by '2'. y = 11.5 Simplifying y = 11.5
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