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Simplifying 4x + -1(5 + 2x) + 10 = 21 4x + (5 * -1 + 2x * -1) + 10 = 21 4x + (-5 + -2x) + 10 = 21 Reorder the terms: -5 + 10 + 4x + -2x = 21 Combine like terms: -5 + 10 = 5 5 + 4x + -2x = 21 Combine like terms: 4x + -2x = 2x 5 + 2x = 21 Solving 5 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 2x = 21 + -5 Combine like terms: 5 + -5 = 0 0 + 2x = 21 + -5 2x = 21 + -5 Combine like terms: 21 + -5 = 16 2x = 16 Divide each side by '2'. x = 8 Simplifying x = 8
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