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Simplifying 3x + 21 = 7 Reorder the terms: 21 + 3x = 7 Solving 21 + 3x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3x = 7 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 7 + -21 3x = 7 + -21 Combine like terms: 7 + -21 = -14 3x = -14 Divide each side by '3'. x = -4.666666667 Simplifying x = -4.666666667
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