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Simplifying -3(7 + -7x) = 7x + 7 (7 * -3 + -7x * -3) = 7x + 7 (-21 + 21x) = 7x + 7 Reorder the terms: -21 + 21x = 7 + 7x Solving -21 + 21x = 7 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. -21 + 21x + -7x = 7 + 7x + -7x Combine like terms: 21x + -7x = 14x -21 + 14x = 7 + 7x + -7x Combine like terms: 7x + -7x = 0 -21 + 14x = 7 + 0 -21 + 14x = 7 Add '21' to each side of the equation. -21 + 21 + 14x = 7 + 21 Combine like terms: -21 + 21 = 0 0 + 14x = 7 + 21 14x = 7 + 21 Combine like terms: 7 + 21 = 28 14x = 28 Divide each side by '14'. x = 2 Simplifying x = 2
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