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Simplifying 7x + 7(2x + -7) = 140 Reorder the terms: 7x + 7(-7 + 2x) = 140 7x + (-7 * 7 + 2x * 7) = 140 7x + (-49 + 14x) = 140 Reorder the terms: -49 + 7x + 14x = 140 Combine like terms: 7x + 14x = 21x -49 + 21x = 140 Solving -49 + 21x = 140 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 = 140 + 49 Combine like terms: -49 + 49 = 0 0 + 21x = 140 + 49 21x = 140 + 49 Combine like terms: 140 + 49 = 189 21x = 189 Divide each side by '21'. x = 9 Simplifying x = 9
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