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Simplifying -7x + -2(7x + 9) = 171 Reorder the terms: -7x + -2(9 + 7x) = 171 -7x + (9 * -2 + 7x * -2) = 171 -7x + (-18 + -14x) = 171 Reorder the terms: -18 + -7x + -14x = 171 Combine like terms: -7x + -14x = -21x -18 + -21x = 171 Solving -18 + -21x = 171 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + -21x = 171 + 18 Combine like terms: -18 + 18 = 0 0 + -21x = 171 + 18 -21x = 171 + 18 Combine like terms: 171 + 18 = 189 -21x = 189 Divide each side by '-21'. x = -9 Simplifying x = -9
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