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Simplifying 5x + -1(4x + -1) = 21 Reorder the terms: 5x + -1(-1 + 4x) = 21 5x + (-1 * -1 + 4x * -1) = 21 5x + (1 + -4x) = 21 Reorder the terms: 1 + 5x + -4x = 21 Combine like terms: 5x + -4x = 1x 1 + 1x = 21 Solving 1 + 1x = 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 + 1x = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 1x = 21 + -1 1x = 21 + -1 Combine like terms: 21 + -1 = 20 1x = 20 Divide each side by '1'. x = 20 Simplifying x = 20
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