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Simplifying 120 + -21x = 9x Solving 120 + -21x = 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. 120 + -21x + -9x = 9x + -9x Combine like terms: -21x + -9x = -30x 120 + -30x = 9x + -9x Combine like terms: 9x + -9x = 0 120 + -30x = 0 Add '-120' to each side of the equation. 120 + -120 + -30x = 0 + -120 Combine like terms: 120 + -120 = 0 0 + -30x = 0 + -120 -30x = 0 + -120 Combine like terms: 0 + -120 = -120 -30x = -120 Divide each side by '-30'. x = 4 Simplifying x = 4
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