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