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Simplifying 3 + 7(x + 3) = 21 Reorder the terms: 3 + 7(3 + x) = 21 3 + (3 * 7 + x * 7) = 21 3 + (21 + 7x) = 21 Combine like terms: 3 + 21 = 24 24 + 7x = 21 Solving 24 + 7x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-24' to each side of the equation. 24 + -24 + 7x = 21 + -24 Combine like terms: 24 + -24 = 0 0 + 7x = 21 + -24 7x = 21 + -24 Combine like terms: 21 + -24 = -3 7x = -3 Divide each side by '7'. x = -0.4285714286 Simplifying x = -0.4285714286
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