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Simplifying 3x + 84 = 9x + 12 Reorder the terms: 84 + 3x = 9x + 12 Reorder the terms: 84 + 3x = 12 + 9x Solving 84 + 3x = 12 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 84 + 3x + -9x = 12 + 9x + -9x Combine like terms: 3x + -9x = -6x 84 + -6x = 12 + 9x + -9x Combine like terms: 9x + -9x = 0 84 + -6x = 12 + 0 84 + -6x = 12 Add '-84' to each side of the equation. 84 + -84 + -6x = 12 + -84 Combine like terms: 84 + -84 = 0 0 + -6x = 12 + -84 -6x = 12 + -84 Combine like terms: 12 + -84 = -72 -6x = -72 Divide each side by '-6'. x = 12 Simplifying x = 12
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