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Simplifying 21 + -5x = 4x + -15 Reorder the terms: 21 + -5x = -15 + 4x Solving 21 + -5x = -15 + 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 = -15 + 4x + -4x Combine like terms: -5x + -4x = -9x 21 + -9x = -15 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + -9x = -15 + 0 21 + -9x = -15 Add '-21' to each side of the equation. 21 + -21 + -9x = -15 + -21 Combine like terms: 21 + -21 = 0 0 + -9x = -15 + -21 -9x = -15 + -21 Combine like terms: -15 + -21 = -36 -9x = -36 Divide each side by '-9'. x = 4 Simplifying x = 4
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