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Simplifying 121 + -21x = 9x Solving 121 + -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. 121 + -21x + -9x = 9x + -9x Combine like terms: -21x + -9x = -30x 121 + -30x = 9x + -9x Combine like terms: 9x + -9x = 0 121 + -30x = 0 Add '-121' to each side of the equation. 121 + -121 + -30x = 0 + -121 Combine like terms: 121 + -121 = 0 0 + -30x = 0 + -121 -30x = 0 + -121 Combine like terms: 0 + -121 = -121 -30x = -121 Divide each side by '-30'. x = 4.033333333 Simplifying x = 4.033333333
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