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Simplifying 2x + -6 = 21 + -1x Reorder the terms: -6 + 2x = 21 + -1x Solving -6 + 2x = 21 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. -6 + 2x + x = 21 + -1x + x Combine like terms: 2x + x = 3x -6 + 3x = 21 + -1x + x Combine like terms: -1x + x = 0 -6 + 3x = 21 + 0 -6 + 3x = 21 Add '6' to each side of the equation. -6 + 6 + 3x = 21 + 6 Combine like terms: -6 + 6 = 0 0 + 3x = 21 + 6 3x = 21 + 6 Combine like terms: 21 + 6 = 27 3x = 27 Divide each side by '3'. x = 9 Simplifying x = 9
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