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Simplifying -2X + -1(2X + 5) = 21 Reorder the terms: -2X + -1(5 + 2X) = 21 -2X + (5 * -1 + 2X * -1) = 21 -2X + (-5 + -2X) = 21 Reorder the terms: -5 + -2X + -2X = 21 Combine like terms: -2X + -2X = -4X -5 + -4X = 21 Solving -5 + -4X = 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 + -4X = 21 + 5 Combine like terms: -5 + 5 = 0 0 + -4X = 21 + 5 -4X = 21 + 5 Combine like terms: 21 + 5 = 26 -4X = 26 Divide each side by '-4'. X = -6.5 Simplifying X = -6.5
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