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Simplifying 21 = 5x + 3x + 4 Reorder the terms: 21 = 4 + 5x + 3x Combine like terms: 5x + 3x = 8x 21 = 4 + 8x Solving 21 = 4 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. 21 + -8x = 4 + 8x + -8x Combine like terms: 8x + -8x = 0 21 + -8x = 4 + 0 21 + -8x = 4 Add '-21' to each side of the equation. 21 + -21 + -8x = 4 + -21 Combine like terms: 21 + -21 = 0 0 + -8x = 4 + -21 -8x = 4 + -21 Combine like terms: 4 + -21 = -17 -8x = -17 Divide each side by '-8'. x = 2.125 Simplifying x = 2.125
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