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Simplifying -2x + -5y + 4x = 21 Reorder the terms: -2x + 4x + -5y = 21 Combine like terms: -2x + 4x = 2x 2x + -5y = 21 Solving 2x + -5y = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5y' to each side of the equation. 2x + -5y + 5y = 21 + 5y Combine like terms: -5y + 5y = 0 2x + 0 = 21 + 5y 2x = 21 + 5y Divide each side by '2'. x = 10.5 + 2.5y Simplifying x = 10.5 + 2.5y
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