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Simplifying x + -1(12 + -1x) = 28 x + (12 * -1 + -1x * -1) = 28 x + (-12 + 1x) = 28 Reorder the terms: -12 + x + 1x = 28 Combine like terms: x + 1x = 2x -12 + 2x = 28 Solving -12 + 2x = 28 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 2x = 28 + 12 Combine like terms: -12 + 12 = 0 0 + 2x = 28 + 12 2x = 28 + 12 Combine like terms: 28 + 12 = 40 2x = 40 Divide each side by '2'. x = 20 Simplifying x = 20
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