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Simplifying x + 3 = 4x + 21 Reorder the terms: 3 + x = 4x + 21 Reorder the terms: 3 + x = 21 + 4x Solving 3 + x = 21 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 3 + x + -4x = 21 + 4x + -4x Combine like terms: x + -4x = -3x 3 + -3x = 21 + 4x + -4x Combine like terms: 4x + -4x = 0 3 + -3x = 21 + 0 3 + -3x = 21 Add '-3' to each side of the equation. 3 + -3 + -3x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + -3x = 21 + -3 -3x = 21 + -3 Combine like terms: 21 + -3 = 18 -3x = 18 Divide each side by '-3'. x = -6 Simplifying x = -6
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