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Simplifying 99 + -3x = 10x + -21 Reorder the terms: 99 + -3x = -21 + 10x Solving 99 + -3x = -21 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. 99 + -3x + -10x = -21 + 10x + -10x Combine like terms: -3x + -10x = -13x 99 + -13x = -21 + 10x + -10x Combine like terms: 10x + -10x = 0 99 + -13x = -21 + 0 99 + -13x = -21 Add '-99' to each side of the equation. 99 + -99 + -13x = -21 + -99 Combine like terms: 99 + -99 = 0 0 + -13x = -21 + -99 -13x = -21 + -99 Combine like terms: -21 + -99 = -120 -13x = -120 Divide each side by '-13'. x = 9.230769231 Simplifying x = 9.230769231
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