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Simplifying 7x + 2(7x + -7) = 154 Reorder the terms: 7x + 2(-7 + 7x) = 154 7x + (-7 * 2 + 7x * 2) = 154 7x + (-14 + 14x) = 154 Reorder the terms: -14 + 7x + 14x = 154 Combine like terms: 7x + 14x = 21x -14 + 21x = 154 Solving -14 + 21x = 154 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + 21x = 154 + 14 Combine like terms: -14 + 14 = 0 0 + 21x = 154 + 14 21x = 154 + 14 Combine like terms: 154 + 14 = 168 21x = 168 Divide each side by '21'. x = 8 Simplifying x = 8
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