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Simplifying [7x + -7] = 21 Reorder the terms: [-7 + 7x] = 21 Remove brackets around [-7 + 7x] -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 = 28 7x = 28 Divide each side by '7'. x = 4 Simplifying x = 4
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