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Simplifying -3x + 6x + -13 = -21 Reorder the terms: -13 + -3x + 6x = -21 Combine like terms: -3x + 6x = 3x -13 + 3x = -21 Solving -13 + 3x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + 3x = -21 + 13 Combine like terms: -13 + 13 = 0 0 + 3x = -21 + 13 3x = -21 + 13 Combine like terms: -21 + 13 = -8 3x = -8 Divide each side by '3'. x = -2.666666667 Simplifying x = -2.666666667
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