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Simplifying 7x + -1(2x + 20) = 20 Reorder the terms: 7x + -1(20 + 2x) = 20 7x + (20 * -1 + 2x * -1) = 20 7x + (-20 + -2x) = 20 Reorder the terms: -20 + 7x + -2x = 20 Combine like terms: 7x + -2x = 5x -20 + 5x = 20 Solving -20 + 5x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 5x = 20 + 20 Combine like terms: -20 + 20 = 0 0 + 5x = 20 + 20 5x = 20 + 20 Combine like terms: 20 + 20 = 40 5x = 40 Divide each side by '5'. x = 8 Simplifying x = 8
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