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Simplifying 21 + -8x = 3x + -13 Reorder the terms: 21 + -8x = -13 + 3x Solving 21 + -8x = -13 + 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. 21 + -8x + -3x = -13 + 3x + -3x Combine like terms: -8x + -3x = -11x 21 + -11x = -13 + 3x + -3x Combine like terms: 3x + -3x = 0 21 + -11x = -13 + 0 21 + -11x = -13 Add '-21' to each side of the equation. 21 + -21 + -11x = -13 + -21 Combine like terms: 21 + -21 = 0 0 + -11x = -13 + -21 -11x = -13 + -21 Combine like terms: -13 + -21 = -34 -11x = -34 Divide each side by '-11'. x = 3.090909091 Simplifying x = 3.090909091
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