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Simplifying 21 + 8x = 81 + 4x Solving 21 + 8x = 81 + 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 + 8x + -4x = 81 + 4x + -4x Combine like terms: 8x + -4x = 4x 21 + 4x = 81 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + 4x = 81 + 0 21 + 4x = 81 Add '-21' to each side of the equation. 21 + -21 + 4x = 81 + -21 Combine like terms: 21 + -21 = 0 0 + 4x = 81 + -21 4x = 81 + -21 Combine like terms: 81 + -21 = 60 4x = 60 Divide each side by '4'. x = 15 Simplifying x = 15
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