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Simplifying -3x + 3 = 6x + 21 Reorder the terms: 3 + -3x = 6x + 21 Reorder the terms: 3 + -3x = 21 + 6x Solving 3 + -3x = 21 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. 3 + -3x + -6x = 21 + 6x + -6x Combine like terms: -3x + -6x = -9x 3 + -9x = 21 + 6x + -6x Combine like terms: 6x + -6x = 0 3 + -9x = 21 + 0 3 + -9x = 21 Add '-3' to each side of the equation. 3 + -3 + -9x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + -9x = 21 + -3 -9x = 21 + -3 Combine like terms: 21 + -3 = 18 -9x = 18 Divide each side by '-9'. x = -2 Simplifying x = -2
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