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Simplifying 21 + -1x = 4x + -9 Reorder the terms: 21 + -1x = -9 + 4x Solving 21 + -1x = -9 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 21 + -1x + -4x = -9 + 4x + -4x Combine like terms: -1x + -4x = -5x 21 + -5x = -9 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + -5x = -9 + 0 21 + -5x = -9 Add '-21' to each side of the equation. 21 + -21 + -5x = -9 + -21 Combine like terms: 21 + -21 = 0 0 + -5x = -9 + -21 -5x = -9 + -21 Combine like terms: -9 + -21 = -30 -5x = -30 Divide each side by '-5'. x = 6 Simplifying x = 6
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