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Simplifying (21 + x) + 6 = 5x Remove parenthesis around (21 + x) 21 + x + 6 = 5x Reorder the terms: 21 + 6 + x = 5x Combine like terms: 21 + 6 = 27 27 + x = 5x Solving 27 + x = 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 27 + x + -5x = 5x + -5x Combine like terms: x + -5x = -4x 27 + -4x = 5x + -5x Combine like terms: 5x + -5x = 0 27 + -4x = 0 Add '-27' to each side of the equation. 27 + -27 + -4x = 0 + -27 Combine like terms: 27 + -27 = 0 0 + -4x = 0 + -27 -4x = 0 + -27 Combine like terms: 0 + -27 = -27 -4x = -27 Divide each side by '-4'. x = 6.75 Simplifying x = 6.75
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