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Simplifying -7x + -7(-4x + -5) = 140 Reorder the terms: -7x + -7(-5 + -4x) = 140 -7x + (-5 * -7 + -4x * -7) = 140 -7x + (35 + 28x) = 140 Reorder the terms: 35 + -7x + 28x = 140 Combine like terms: -7x + 28x = 21x 35 + 21x = 140 Solving 35 + 21x = 140 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-35' to each side of the equation. 35 + -35 + 21x = 140 + -35 Combine like terms: 35 + -35 = 0 0 + 21x = 140 + -35 21x = 140 + -35 Combine like terms: 140 + -35 = 105 21x = 105 Divide each side by '21'. x = 5 Simplifying x = 5
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