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Simplifying (x + y) + (x + -1y) + (x * y) = 1991 Remove parenthesis around (x + y) x + y + (x + -1y) + (x * y) = 1991 Remove parenthesis around (x + -1y) x + y + x + -1y + (x * y) = 1991 Multiply x * y x + y + x + -1y + (xy) = 1991 x + y + x + -1y + xy = 1991 Reorder the terms: x + x + xy + y + -1y = 1991 Combine like terms: x + x = 2x 2x + xy + y + -1y = 1991 Combine like terms: y + -1y = 0 2x + xy + 0 = 1991 2x + xy = 1991 Solving 2x + xy = 1991 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Reorder the terms: -1991 + 2x + xy = 1991 + -1991 Combine like terms: 1991 + -1991 = 0 -1991 + 2x + xy = 0 The solution to this equation could not be determined.
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