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Simplifying 2(2x + -4) = 21 Reorder the terms: 2(-4 + 2x) = 21 (-4 * 2 + 2x * 2) = 21 (-8 + 4x) = 21 Solving -8 + 4x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 4x = 21 + 8 Combine like terms: -8 + 8 = 0 0 + 4x = 21 + 8 4x = 21 + 8 Combine like terms: 21 + 8 = 29 4x = 29 Divide each side by '4'. x = 7.25 Simplifying x = 7.25
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