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Simplifying 4(2x + -2) + 12 = 21 Reorder the terms: 4(-2 + 2x) + 12 = 21 (-2 * 4 + 2x * 4) + 12 = 21 (-8 + 8x) + 12 = 21 Reorder the terms: -8 + 12 + 8x = 21 Combine like terms: -8 + 12 = 4 4 + 8x = 21 Solving 4 + 8x = 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 + 8x = 21 + -4 Combine like terms: 4 + -4 = 0 0 + 8x = 21 + -4 8x = 21 + -4 Combine like terms: 21 + -4 = 17 8x = 17 Divide each side by '8'. x = 2.125 Simplifying x = 2.125
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