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Simplifying 21x + -3 + 2x + 7 = 72 Reorder the terms: -3 + 7 + 21x + 2x = 72 Combine like terms: -3 + 7 = 4 4 + 21x + 2x = 72 Combine like terms: 21x + 2x = 23x 4 + 23x = 72 Solving 4 + 23x = 72 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 23x = 72 + -4 Combine like terms: 4 + -4 = 0 0 + 23x = 72 + -4 23x = 72 + -4 Combine like terms: 72 + -4 = 68 23x = 68 Divide each side by '23'. x = 2.956521739 Simplifying x = 2.956521739
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