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Simplifying 7(1 + -1x) + 21 = 14 (1 * 7 + -1x * 7) + 21 = 14 (7 + -7x) + 21 = 14 Reorder the terms: 7 + 21 + -7x = 14 Combine like terms: 7 + 21 = 28 28 + -7x = 14 Solving 28 + -7x = 14 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + -7x = 14 + -28 Combine like terms: 28 + -28 = 0 0 + -7x = 14 + -28 -7x = 14 + -28 Combine like terms: 14 + -28 = -14 -7x = -14 Divide each side by '-7'. x = 2 Simplifying x = 2
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