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Simplifying 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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