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Simplifying [3(x + 7)] = 18 Reorder the terms: [3(7 + x)] = 18 [(7 * 3 + x * 3)] = 18 [(21 + 3x)] = 18 [21 + 3x] = 18 Remove brackets around [21 + 3x] 21 + 3x = 18 Solving 21 + 3x = 18 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 = 18 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 18 + -21 3x = 18 + -21 Combine like terms: 18 + -21 = -3 3x = -3 Divide each side by '3'. x = -1 Simplifying x = -1
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