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Simplifying Y + 2y + 21 = 90 Reorder the terms: 21 + Y + 2y = 90 Solving 21 + Y + 2y = 90 Solving for variable 'Y'. Move all terms containing Y to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + Y + -21 + 2y = 90 + -21 Reorder the terms: 21 + -21 + Y + 2y = 90 + -21 Combine like terms: 21 + -21 = 0 0 + Y + 2y = 90 + -21 Y + 2y = 90 + -21 Combine like terms: 90 + -21 = 69 Y + 2y = 69 Add '-2y' to each side of the equation. Y + 2y + -2y = 69 + -2y Combine like terms: 2y + -2y = 0 Y + 0 = 69 + -2y Y = 69 + -2y Simplifying Y = 69 + -2y
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