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Simplifying 21 = 3x + -4x Combine like terms: 3x + -4x = -1x 21 = -1x Solving 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. 21 + x = -1x + x Combine like terms: -1x + x = 0 21 + x = 0 Add '-21' to each side of the equation. 21 + -21 + x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + x = 0 + -21 x = 0 + -21 Combine like terms: 0 + -21 = -21 x = -21 Simplifying x = -21
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