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Simplifying 7[x + 1] = 21 Reorder the terms: 7[1 + x] = 21 [1 * 7 + x * 7] = 21 [7 + 7x] = 21 Solving 7 + 7x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 7x = 21 + -7 Combine like terms: 7 + -7 = 0 0 + 7x = 21 + -7 7x = 21 + -7 Combine like terms: 21 + -7 = 14 7x = 14 Divide each side by '7'. x = 2 Simplifying x = 2
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