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Simplifying 4x + 9 = x + 21 Reorder the terms: 9 + 4x = x + 21 Reorder the terms: 9 + 4x = 21 + x Solving 9 + 4x = 21 + x 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. 9 + 4x + -1x = 21 + x + -1x Combine like terms: 4x + -1x = 3x 9 + 3x = 21 + x + -1x Combine like terms: x + -1x = 0 9 + 3x = 21 + 0 9 + 3x = 21 Add '-9' to each side of the equation. 9 + -9 + 3x = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 3x = 21 + -9 3x = 21 + -9 Combine like terms: 21 + -9 = 12 3x = 12 Divide each side by '3'. x = 4 Simplifying x = 4
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