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Simplifying [3x + 7] = 15 Reorder the terms: [7 + 3x] = 15 Remove brackets around [7 + 3x] 7 + 3x = 15 Solving 7 + 3x = 15 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 + 3x = 15 + -7 Combine like terms: 7 + -7 = 0 0 + 3x = 15 + -7 3x = 15 + -7 Combine like terms: 15 + -7 = 8 3x = 8 Divide each side by '3'. x = 2.666666667 Simplifying x = 2.666666667
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