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Simplifying 21 + -1x = 31 + -3x Solving 21 + -1x = 31 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. 21 + -1x + 3x = 31 + -3x + 3x Combine like terms: -1x + 3x = 2x 21 + 2x = 31 + -3x + 3x Combine like terms: -3x + 3x = 0 21 + 2x = 31 + 0 21 + 2x = 31 Add '-21' to each side of the equation. 21 + -21 + 2x = 31 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = 31 + -21 2x = 31 + -21 Combine like terms: 31 + -21 = 10 2x = 10 Divide each side by '2'. x = 5 Simplifying x = 5
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