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Simplifying x + 21 = 4x Reorder the terms: 21 + x = 4x Solving 21 + x = 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. 21 + x + -4x = 4x + -4x Combine like terms: x + -4x = -3x 21 + -3x = 4x + -4x Combine like terms: 4x + -4x = 0 21 + -3x = 0 Add '-21' to each side of the equation. 21 + -21 + -3x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = 0 + -21 -3x = 0 + -21 Combine like terms: 0 + -21 = -21 -3x = -21 Divide each side by '-3'. x = 7 Simplifying x = 7
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