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Simplifying 2y + -1 = 20 + -1y Reorder the terms: -1 + 2y = 20 + -1y Solving -1 + 2y = 20 + -1y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add 'y' to each side of the equation. -1 + 2y + y = 20 + -1y + y Combine like terms: 2y + y = 3y -1 + 3y = 20 + -1y + y Combine like terms: -1y + y = 0 -1 + 3y = 20 + 0 -1 + 3y = 20 Add '1' to each side of the equation. -1 + 1 + 3y = 20 + 1 Combine like terms: -1 + 1 = 0 0 + 3y = 20 + 1 3y = 20 + 1 Combine like terms: 20 + 1 = 21 3y = 21 Divide each side by '3'. y = 7 Simplifying y = 7
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