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Simplifying 3x + 21 = 11x + -51 Reorder the terms: 21 + 3x = 11x + -51 Reorder the terms: 21 + 3x = -51 + 11x Solving 21 + 3x = -51 + 11x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11x' to each side of the equation. 21 + 3x + -11x = -51 + 11x + -11x Combine like terms: 3x + -11x = -8x 21 + -8x = -51 + 11x + -11x Combine like terms: 11x + -11x = 0 21 + -8x = -51 + 0 21 + -8x = -51 Add '-21' to each side of the equation. 21 + -21 + -8x = -51 + -21 Combine like terms: 21 + -21 = 0 0 + -8x = -51 + -21 -8x = -51 + -21 Combine like terms: -51 + -21 = -72 -8x = -72 Divide each side by '-8'. x = 9 Simplifying x = 9
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