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Simplifying 21x + 12 = x + 3 Reorder the terms: 12 + 21x = x + 3 Reorder the terms: 12 + 21x = 3 + x Solving 12 + 21x = 3 + 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. 12 + 21x + -1x = 3 + x + -1x Combine like terms: 21x + -1x = 20x 12 + 20x = 3 + x + -1x Combine like terms: x + -1x = 0 12 + 20x = 3 + 0 12 + 20x = 3 Add '-12' to each side of the equation. 12 + -12 + 20x = 3 + -12 Combine like terms: 12 + -12 = 0 0 + 20x = 3 + -12 20x = 3 + -12 Combine like terms: 3 + -12 = -9 20x = -9 Divide each side by '20'. x = -0.45 Simplifying x = -0.45
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