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Simplifying -7x + 7(-3x + 7) = -21 Reorder the terms: -7x + 7(7 + -3x) = -21 -7x + (7 * 7 + -3x * 7) = -21 -7x + (49 + -21x) = -21 Reorder the terms: 49 + -7x + -21x = -21 Combine like terms: -7x + -21x = -28x 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 = -70 -28x = -70 Divide each side by '-28'. x = 2.5 Simplifying x = 2.5
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