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Simplifying 90 = 81 + y Solving 90 = 81 + y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1y' to each side of the equation. 90 + -1y = 81 + y + -1y Combine like terms: y + -1y = 0 90 + -1y = 81 + 0 90 + -1y = 81 Add '-90' to each side of the equation. 90 + -90 + -1y = 81 + -90 Combine like terms: 90 + -90 = 0 0 + -1y = 81 + -90 -1y = 81 + -90 Combine like terms: 81 + -90 = -9 -1y = -9 Divide each side by '-1'. y = 9 Simplifying y = 9
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