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Simplifying 20 + -8x = -19 + -21x Solving 20 + -8x = -19 + -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. 20 + -8x + 21x = -19 + -21x + 21x Combine like terms: -8x + 21x = 13x 20 + 13x = -19 + -21x + 21x Combine like terms: -21x + 21x = 0 20 + 13x = -19 + 0 20 + 13x = -19 Add '-20' to each side of the equation. 20 + -20 + 13x = -19 + -20 Combine like terms: 20 + -20 = 0 0 + 13x = -19 + -20 13x = -19 + -20 Combine like terms: -19 + -20 = -39 13x = -39 Divide each side by '13'. x = -3 Simplifying x = -3
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