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Simplifying 3(x + -1) = 21 Reorder the terms: 3(-1 + x) = 21 (-1 * 3 + x * 3) = 21 (-3 + 3x) = 21 Solving -3 + 3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 3x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 3x = 21 + 3 3x = 21 + 3 Combine like terms: 21 + 3 = 24 3x = 24 Divide each side by '3'. x = 8 Simplifying x = 8
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