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Simplifying 8x + 13 = -21 + -4x Reorder the terms: 13 + 8x = -21 + -4x Solving 13 + 8x = -21 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 13 + 8x + 4x = -21 + -4x + 4x Combine like terms: 8x + 4x = 12x 13 + 12x = -21 + -4x + 4x Combine like terms: -4x + 4x = 0 13 + 12x = -21 + 0 13 + 12x = -21 Add '-13' to each side of the equation. 13 + -13 + 12x = -21 + -13 Combine like terms: 13 + -13 = 0 0 + 12x = -21 + -13 12x = -21 + -13 Combine like terms: -21 + -13 = -34 12x = -34 Divide each side by '12'. x = -2.833333333 Simplifying x = -2.833333333
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