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Simplifying 18 + 3x = 12x + 21 Reorder the terms: 18 + 3x = 21 + 12x Solving 18 + 3x = 21 + 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. 18 + 3x + -12x = 21 + 12x + -12x Combine like terms: 3x + -12x = -9x 18 + -9x = 21 + 12x + -12x Combine like terms: 12x + -12x = 0 18 + -9x = 21 + 0 18 + -9x = 21 Add '-18' to each side of the equation. 18 + -18 + -9x = 21 + -18 Combine like terms: 18 + -18 = 0 0 + -9x = 21 + -18 -9x = 21 + -18 Combine like terms: 21 + -18 = 3 -9x = 3 Divide each side by '-9'. x = -0.3333333333 Simplifying x = -0.3333333333
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