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Simplifying 2015 * 1999 + -1998 * 2004 + -2007 * 2002 + 2000 * 1997 = 0 Multiply 2015 * 1999 4027985 + -1998 * 2004 + -2007 * 2002 + 2000 * 1997 = 0 Multiply -1998 * 2004 4027985 + -4003992 + -2007 * 2002 + 2000 * 1997 = 0 Multiply -2007 * 2002 4027985 + -4003992 + -4018014 + 2000 * 1997 = 0 Multiply 2000 * 1997 4027985 + -4003992 + -4018014 + 3994000 = 0 Combine like terms: 4027985 + -4003992 = 23993 23993 + -4018014 + 3994000 = 0 Combine like terms: 23993 + -4018014 = -3994021 -3994021 + 3994000 = 0 Combine like terms: -3994021 + 3994000 = -21 -21 = 0 Solving -21 = 0 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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