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Simplifying 138 + -3x = 6x + 21 Reorder the terms: 138 + -3x = 21 + 6x Solving 138 + -3x = 21 + 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. 138 + -3x + -6x = 21 + 6x + -6x Combine like terms: -3x + -6x = -9x 138 + -9x = 21 + 6x + -6x Combine like terms: 6x + -6x = 0 138 + -9x = 21 + 0 138 + -9x = 21 Add '-138' to each side of the equation. 138 + -138 + -9x = 21 + -138 Combine like terms: 138 + -138 = 0 0 + -9x = 21 + -138 -9x = 21 + -138 Combine like terms: 21 + -138 = -117 -9x = -117 Divide each side by '-9'. x = 13 Simplifying x = 13
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