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Simplifying -7(7 + -3x) = -28 (7 * -7 + -3x * -7) = -28 (-49 + 21x) = -28 Solving -49 + 21x = -28 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 + 21x = -28 + 49 Combine like terms: -49 + 49 = 0 0 + 21x = -28 + 49 21x = -28 + 49 Combine like terms: -28 + 49 = 21 21x = 21 Divide each side by '21'. x = 1 Simplifying x = 1
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