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Simplifying 20 + -1y = 9 Solving 20 + -1y = 9 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -1y = 9 + -20 Combine like terms: 20 + -20 = 0 0 + -1y = 9 + -20 -1y = 9 + -20 Combine like terms: 9 + -20 = -11 -1y = -11 Divide each side by '-1'. y = 11 Simplifying y = 11
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