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Simplifying -21 = 3x + -1x + 1 Reorder the terms: -21 = 1 + 3x + -1x Combine like terms: 3x + -1x = 2x -21 = 1 + 2x Solving -21 = 1 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. -21 + -2x = 1 + 2x + -2x Combine like terms: 2x + -2x = 0 -21 + -2x = 1 + 0 -21 + -2x = 1 Add '21' to each side of the equation. -21 + 21 + -2x = 1 + 21 Combine like terms: -21 + 21 = 0 0 + -2x = 1 + 21 -2x = 1 + 21 Combine like terms: 1 + 21 = 22 -2x = 22 Divide each side by '-2'. x = -11 Simplifying x = -11
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