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Simplifying 3x + 4 = 21 + x Reorder the terms: 4 + 3x = 21 + x Solving 4 + 3x = 21 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 4 + 3x + -1x = 21 + x + -1x Combine like terms: 3x + -1x = 2x 4 + 2x = 21 + x + -1x Combine like terms: x + -1x = 0 4 + 2x = 21 + 0 4 + 2x = 21 Add '-4' to each side of the equation. 4 + -4 + 2x = 21 + -4 Combine like terms: 4 + -4 = 0 0 + 2x = 21 + -4 2x = 21 + -4 Combine like terms: 21 + -4 = 17 2x = 17 Divide each side by '2'. x = 8.5 Simplifying x = 8.5
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