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Simplifying 2x + -1(x + -1) = 21 + -4x Reorder the terms: 2x + -1(-1 + x) = 21 + -4x 2x + (-1 * -1 + x * -1) = 21 + -4x 2x + (1 + -1x) = 21 + -4x Reorder the terms: 1 + 2x + -1x = 21 + -4x Combine like terms: 2x + -1x = 1x 1 + 1x = 21 + -4x Solving 1 + 1x = 21 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 1 + 1x + 4x = 21 + -4x + 4x Combine like terms: 1x + 4x = 5x 1 + 5x = 21 + -4x + 4x Combine like terms: -4x + 4x = 0 1 + 5x = 21 + 0 1 + 5x = 21 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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