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Simplifying 5x + 2(-2x + 6) = 21 Reorder the terms: 5x + 2(6 + -2x) = 21 5x + (6 * 2 + -2x * 2) = 21 5x + (12 + -4x) = 21 Reorder the terms: 12 + 5x + -4x = 21 Combine like terms: 5x + -4x = 1x 12 + 1x = 21 Solving 12 + 1x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 1x = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 1x = 21 + -12 1x = 21 + -12 Combine like terms: 21 + -12 = 9 1x = 9 Divide each side by '1'. x = 9 Simplifying x = 9
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