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Simplifying 4(2x + 5) + -7x = 21 Reorder the terms: 4(5 + 2x) + -7x = 21 (5 * 4 + 2x * 4) + -7x = 21 (20 + 8x) + -7x = 21 Combine like terms: 8x + -7x = 1x 20 + 1x = 21 Solving 20 + 1x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 1x = 21 + -20 Combine like terms: 20 + -20 = 0 0 + 1x = 21 + -20 1x = 21 + -20 Combine like terms: 21 + -20 = 1 1x = 1 Divide each side by '1'. x = 1 Simplifying x = 1
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