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Simplifying 12x + 21 = 6x + 135 Reorder the terms: 21 + 12x = 6x + 135 Reorder the terms: 21 + 12x = 135 + 6x Solving 21 + 12x = 135 + 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. 21 + 12x + -6x = 135 + 6x + -6x Combine like terms: 12x + -6x = 6x 21 + 6x = 135 + 6x + -6x Combine like terms: 6x + -6x = 0 21 + 6x = 135 + 0 21 + 6x = 135 Add '-21' to each side of the equation. 21 + -21 + 6x = 135 + -21 Combine like terms: 21 + -21 = 0 0 + 6x = 135 + -21 6x = 135 + -21 Combine like terms: 135 + -21 = 114 6x = 114 Divide each side by '6'. x = 19 Simplifying x = 19
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