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Simplifying -7x + 2(-7x + -14) = -133 Reorder the terms: -7x + 2(-14 + -7x) = -133 -7x + (-14 * 2 + -7x * 2) = -133 -7x + (-28 + -14x) = -133 Reorder the terms: -28 + -7x + -14x = -133 Combine like terms: -7x + -14x = -21x -28 + -21x = -133 Solving -28 + -21x = -133 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + -21x = -133 + 28 Combine like terms: -28 + 28 = 0 0 + -21x = -133 + 28 -21x = -133 + 28 Combine like terms: -133 + 28 = -105 -21x = -105 Divide each side by '-21'. x = 5 Simplifying x = 5
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