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Simplifying 7(-4x + 7) = 21 Reorder the terms: 7(7 + -4x) = 21 (7 * 7 + -4x * 7) = 21 (49 + -28x) = 21 Solving 49 + -28x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-49' to each side of the equation. 49 + -49 + -28x = 21 + -49 Combine like terms: 49 + -49 = 0 0 + -28x = 21 + -49 -28x = 21 + -49 Combine like terms: 21 + -49 = -28 -28x = -28 Divide each side by '-28'. x = 1 Simplifying x = 1
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