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Simplifying 5x + -7(-4x + 20) = 91 Reorder the terms: 5x + -7(20 + -4x) = 91 5x + (20 * -7 + -4x * -7) = 91 5x + (-140 + 28x) = 91 Reorder the terms: -140 + 5x + 28x = 91 Combine like terms: 5x + 28x = 33x -140 + 33x = 91 Solving -140 + 33x = 91 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '140' to each side of the equation. -140 + 140 + 33x = 91 + 140 Combine like terms: -140 + 140 = 0 0 + 33x = 91 + 140 33x = 91 + 140 Combine like terms: 91 + 140 = 231 33x = 231 Divide each side by '33'. x = 7 Simplifying x = 7
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