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Simplifying 3x + (-8) = -21 3x + -8 = -21 Reorder the terms: -8 + 3x = -21 Solving -8 + 3x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 3x = -21 + 8 Combine like terms: -8 + 8 = 0 0 + 3x = -21 + 8 3x = -21 + 8 Combine like terms: -21 + 8 = -13 3x = -13 Divide each side by '3'. x = -4.333333333 Simplifying x = -4.333333333
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