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Simplifying 21 = x + 3y Solving 21 = x + 3y Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 21 + -1x = x + -1x + 3y Combine like terms: x + -1x = 0 21 + -1x = 0 + 3y 21 + -1x = 3y Add '-21' to each side of the equation. 21 + -21 + -1x = -21 + 3y Combine like terms: 21 + -21 = 0 0 + -1x = -21 + 3y -1x = -21 + 3y Divide each side by '-1'. x = 21 + -3y Simplifying x = 21 + -3y
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