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Simplifying (2x) + -1(7 + -1x) = 12 (2x) + (7 * -1 + -1x * -1) = 12 (2x) + (-7 + 1x) = 12 Reorder the terms: -7 + (2x) + 1x = 12 Combine like terms: (2x) + 1x = 3x -7 + 3x = 12 Solving -7 + 3x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 3x = 12 + 7 Combine like terms: -7 + 7 = 0 0 + 3x = 12 + 7 3x = 12 + 7 Combine like terms: 12 + 7 = 19 3x = 19 Divide each side by '3'. x = 6.333333333 Simplifying x = 6.333333333
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