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Simplifying 5x + -1(3 + -1x) = 21 5x + (3 * -1 + -1x * -1) = 21 5x + (-3 + 1x) = 21 Reorder the terms: -3 + 5x + 1x = 21 Combine like terms: 5x + 1x = 6x -3 + 6x = 21 Solving -3 + 6x = 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 + 6x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 6x = 21 + 3 6x = 21 + 3 Combine like terms: 21 + 3 = 24 6x = 24 Divide each side by '6'. x = 4 Simplifying x = 4
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