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Simplifying 21 + -5x = 12 + 4x Solving 21 + -5x = 12 + 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 + -5x + -4x = 12 + 4x + -4x Combine like terms: -5x + -4x = -9x 21 + -9x = 12 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + -9x = 12 + 0 21 + -9x = 12 Add '-21' to each side of the equation. 21 + -21 + -9x = 12 + -21 Combine like terms: 21 + -21 = 0 0 + -9x = 12 + -21 -9x = 12 + -21 Combine like terms: 12 + -21 = -9 -9x = -9 Divide each side by '-9'. x = 1 Simplifying x = 1
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