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Simplifying 3x + 243 = 12x + -9 Reorder the terms: 243 + 3x = 12x + -9 Reorder the terms: 243 + 3x = -9 + 12x Solving 243 + 3x = -9 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. 243 + 3x + -12x = -9 + 12x + -12x Combine like terms: 3x + -12x = -9x 243 + -9x = -9 + 12x + -12x Combine like terms: 12x + -12x = 0 243 + -9x = -9 + 0 243 + -9x = -9 Add '-243' to each side of the equation. 243 + -243 + -9x = -9 + -243 Combine like terms: 243 + -243 = 0 0 + -9x = -9 + -243 -9x = -9 + -243 Combine like terms: -9 + -243 = -252 -9x = -252 Divide each side by '-9'. x = 28 Simplifying x = 28
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