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Simplifying 3x + 2(x + -2) = 21 Reorder the terms: 3x + 2(-2 + x) = 21 3x + (-2 * 2 + x * 2) = 21 3x + (-4 + 2x) = 21 Reorder the terms: -4 + 3x + 2x = 21 Combine like terms: 3x + 2x = 5x -4 + 5x = 21 Solving -4 + 5x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 5x = 21 + 4 Combine like terms: -4 + 4 = 0 0 + 5x = 21 + 4 5x = 21 + 4 Combine like terms: 21 + 4 = 25 5x = 25 Divide each side by '5'. x = 5 Simplifying x = 5
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