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Simplifying 21 = -1x + 4x + 9 Reorder the terms: 21 = 9 + -1x + 4x Combine like terms: -1x + 4x = 3x 21 = 9 + 3x Solving 21 = 9 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 21 + -3x = 9 + 3x + -3x Combine like terms: 3x + -3x = 0 21 + -3x = 9 + 0 21 + -3x = 9 Add '-21' to each side of the equation. 21 + -21 + -3x = 9 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = 9 + -21 -3x = 9 + -21 Combine like terms: 9 + -21 = -12 -3x = -12 Divide each side by '-3'. x = 4 Simplifying x = 4
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