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Simplifying -3x + -4(-5x + 7) = 91 Reorder the terms: -3x + -4(7 + -5x) = 91 -3x + (7 * -4 + -5x * -4) = 91 -3x + (-28 + 20x) = 91 Reorder the terms: -28 + -3x + 20x = 91 Combine like terms: -3x + 20x = 17x -28 + 17x = 91 Solving -28 + 17x = 91 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 + 17x = 91 + 28 Combine like terms: -28 + 28 = 0 0 + 17x = 91 + 28 17x = 91 + 28 Combine like terms: 91 + 28 = 119 17x = 119 Divide each side by '17'. x = 7 Simplifying x = 7
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