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Simplifying -21 + -1x = 45 + 2x Solving -21 + -1x = 45 + 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 + -1x + -2x = 45 + 2x + -2x Combine like terms: -1x + -2x = -3x -21 + -3x = 45 + 2x + -2x Combine like terms: 2x + -2x = 0 -21 + -3x = 45 + 0 -21 + -3x = 45 Add '21' to each side of the equation. -21 + 21 + -3x = 45 + 21 Combine like terms: -21 + 21 = 0 0 + -3x = 45 + 21 -3x = 45 + 21 Combine like terms: 45 + 21 = 66 -3x = 66 Divide each side by '-3'. x = -22 Simplifying x = -22
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