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Simplifying (X) * 2 + (Y + -1) * 2 = 81 Reorder the terms for easier multiplication: 2X + (Y + -1) * 2 = 81 Reorder the terms: 2X + (-1 + Y) * 2 = 81 Reorder the terms for easier multiplication: 2X + 2(-1 + Y) = 81 2X + (-1 * 2 + Y * 2) = 81 2X + (-2 + 2Y) = 81 Reorder the terms: -2 + 2X + 2Y = 81 Solving -2 + 2X + 2Y = 81 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2X + 2 + 2Y = 81 + 2 Reorder the terms: -2 + 2 + 2X + 2Y = 81 + 2 Combine like terms: -2 + 2 = 0 0 + 2X + 2Y = 81 + 2 2X + 2Y = 81 + 2 Combine like terms: 81 + 2 = 83 2X + 2Y = 83 Add '-2Y' to each side of the equation. 2X + 2Y + -2Y = 83 + -2Y Combine like terms: 2Y + -2Y = 0 2X + 0 = 83 + -2Y 2X = 83 + -2Y Divide each side by '2'. X = 41.5 + -1Y Simplifying X = 41.5 + -1Y
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