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Simplifying 3x + 9 + 4y = 21 Reorder the terms: 9 + 3x + 4y = 21 Solving 9 + 3x + 4y = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + 3x + -9 + 4y = 21 + -9 Reorder the terms: 9 + -9 + 3x + 4y = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 3x + 4y = 21 + -9 3x + 4y = 21 + -9 Combine like terms: 21 + -9 = 12 3x + 4y = 12 Add '-4y' to each side of the equation. 3x + 4y + -4y = 12 + -4y Combine like terms: 4y + -4y = 0 3x + 0 = 12 + -4y 3x = 12 + -4y Divide each side by '3'. x = 4 + -1.333333333y Simplifying x = 4 + -1.333333333y
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