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Simplifying -3x + -21 + 2 = 20 Reorder the terms: -21 + 2 + -3x = 20 Combine like terms: -21 + 2 = -19 -19 + -3x = 20 Solving -19 + -3x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '19' to each side of the equation. -19 + 19 + -3x = 20 + 19 Combine like terms: -19 + 19 = 0 0 + -3x = 20 + 19 -3x = 20 + 19 Combine like terms: 20 + 19 = 39 -3x = 39 Divide each side by '-3'. x = -13 Simplifying x = -13
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