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Simplifying 4x + -1(x + -2) = 21 Reorder the terms: 4x + -1(-2 + x) = 21 4x + (-2 * -1 + x * -1) = 21 4x + (2 + -1x) = 21 Reorder the terms: 2 + 4x + -1x = 21 Combine like terms: 4x + -1x = 3x 2 + 3x = 21 Solving 2 + 3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 3x = 21 + -2 Combine like terms: 2 + -2 = 0 0 + 3x = 21 + -2 3x = 21 + -2 Combine like terms: 21 + -2 = 19 3x = 19 Divide each side by '3'. x = 6.333333333 Simplifying x = 6.333333333
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