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Simplifying 3(x + 7) + 3x = x Reorder the terms: 3(7 + x) + 3x = x (7 * 3 + x * 3) + 3x = x (21 + 3x) + 3x = x Combine like terms: 3x + 3x = 6x 21 + 6x = x Solving 21 + 6x = 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 + 6x + -1x = x + -1x Combine like terms: 6x + -1x = 5x 21 + 5x = x + -1x Combine like terms: x + -1x = 0 21 + 5x = 0 Add '-21' to each side of the equation. 21 + -21 + 5x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 5x = 0 + -21 5x = 0 + -21 Combine like terms: 0 + -21 = -21 5x = -21 Divide each side by '5'. x = -4.2 Simplifying x = -4.2
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