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Simplifying 6x + -1(x + -1) = 21 Reorder the terms: 6x + -1(-1 + x) = 21 6x + (-1 * -1 + x * -1) = 21 6x + (1 + -1x) = 21 Reorder the terms: 1 + 6x + -1x = 21 Combine like terms: 6x + -1x = 5x 1 + 5x = 21 Solving 1 + 5x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 5x = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 5x = 21 + -1 5x = 21 + -1 Combine like terms: 21 + -1 = 20 5x = 20 Divide each side by '5'. x = 4 Simplifying x = 4
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