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Simplifying 120 + -6x = 3x + 21 Reorder the terms: 120 + -6x = 21 + 3x Solving 120 + -6x = 21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 120 + -6x + -3x = 21 + 3x + -3x Combine like terms: -6x + -3x = -9x 120 + -9x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 120 + -9x = 21 + 0 120 + -9x = 21 Add '-120' to each side of the equation. 120 + -120 + -9x = 21 + -120 Combine like terms: 120 + -120 = 0 0 + -9x = 21 + -120 -9x = 21 + -120 Combine like terms: 21 + -120 = -99 -9x = -99 Divide each side by '-9'. x = 11 Simplifying x = 11
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