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Simplifying 2(4x + -5) + 7 = 21 Reorder the terms: 2(-5 + 4x) + 7 = 21 (-5 * 2 + 4x * 2) + 7 = 21 (-10 + 8x) + 7 = 21 Reorder the terms: -10 + 7 + 8x = 21 Combine like terms: -10 + 7 = -3 -3 + 8x = 21 Solving -3 + 8x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 8x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 8x = 21 + 3 8x = 21 + 3 Combine like terms: 21 + 3 = 24 8x = 24 Divide each side by '8'. x = 3 Simplifying x = 3
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