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Simplifying 7x + -1(2x + 5) = 55 Reorder the terms: 7x + -1(5 + 2x) = 55 7x + (5 * -1 + 2x * -1) = 55 7x + (-5 + -2x) = 55 Reorder the terms: -5 + 7x + -2x = 55 Combine like terms: 7x + -2x = 5x -5 + 5x = 55 Solving -5 + 5x = 55 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 5x = 55 + 5 Combine like terms: -5 + 5 = 0 0 + 5x = 55 + 5 5x = 55 + 5 Combine like terms: 55 + 5 = 60 5x = 60 Divide each side by '5'. x = 12 Simplifying x = 12
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