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Simplifying 7x + 8 = -21 + -5x Reorder the terms: 8 + 7x = -21 + -5x Solving 8 + 7x = -21 + -5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5x' to each side of the equation. 8 + 7x + 5x = -21 + -5x + 5x Combine like terms: 7x + 5x = 12x 8 + 12x = -21 + -5x + 5x Combine like terms: -5x + 5x = 0 8 + 12x = -21 + 0 8 + 12x = -21 Add '-8' to each side of the equation. 8 + -8 + 12x = -21 + -8 Combine like terms: 8 + -8 = 0 0 + 12x = -21 + -8 12x = -21 + -8 Combine like terms: -21 + -8 = -29 12x = -29 Divide each side by '12'. x = -2.416666667 Simplifying x = -2.416666667
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