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Simplifying 2x + 21 + y = 90 Reorder the terms: 21 + 2x + y = 90 Solving 21 + 2x + y = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + 2x + -21 + y = 90 + -21 Reorder the terms: 21 + -21 + 2x + y = 90 + -21 Combine like terms: 21 + -21 = 0 0 + 2x + y = 90 + -21 2x + y = 90 + -21 Combine like terms: 90 + -21 = 69 2x + y = 69 Add '-1y' to each side of the equation. 2x + y + -1y = 69 + -1y Combine like terms: y + -1y = 0 2x + 0 = 69 + -1y 2x = 69 + -1y Divide each side by '2'. x = 34.5 + -0.5y Simplifying x = 34.5 + -0.5y
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