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Simplifying 3(x + 7) = 13 Reorder the terms: 3(7 + x) = 13 (7 * 3 + x * 3) = 13 (21 + 3x) = 13 Solving 21 + 3x = 13 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 = 13 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 13 + -21 3x = 13 + -21 Combine like terms: 13 + -21 = -8 3x = -8 Divide each side by '3'. x = -2.666666667 Simplifying x = -2.666666667
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