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Simplifying 2x + -1(5 + -1x) = 7 2x + (5 * -1 + -1x * -1) = 7 2x + (-5 + 1x) = 7 Reorder the terms: -5 + 2x + 1x = 7 Combine like terms: 2x + 1x = 3x -5 + 3x = 7 Solving -5 + 3x = 7 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 + 3x = 7 + 5 Combine like terms: -5 + 5 = 0 0 + 3x = 7 + 5 3x = 7 + 5 Combine like terms: 7 + 5 = 12 3x = 12 Divide each side by '3'. x = 4 Simplifying x = 4
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